(Last update: 9th January 2021)

- Koji Aoyama and Masashi Toyoda,
*Approximation of zeros of an accretive operator and fixed points of nonexpansive mappings in a Banach space*, Linear and Nonlinear Analysis 6 (2020), no. 2, 303--313. - Koji Aoyama and Fumiaki Kohsaka,
*Strongly quasinonexpansive mappings, III*, Linear and Nonlinear Analysis 6 (2020), no. 1, 1-12. - Koji Aoyama and Masashi Toyoda,
*Approximation of common fixed points of strongly nonexpansive sequences in a Banach space*, Journal of Fixed Point Theory and Applications, Volume 21, Issue 1, (2019) 21:35. (DOI: 10.1007/s11784-019-0670-6) PDF - Koji Aoyama and Kei Zembayashi,
*Strongly quasinonexpansive mappings, II*, Journal of Nonlinear and Convex Analysis, 19 (2018), no. 10, 1655-1663. (Proceedings of Fifth Asian Conference on Nonlinear Analysis and Optimization) - Koji Aoyama,
*Parallel hybrid methods for relatively nonexpansive mappings*, Josai Mathematical Monographs 11 (2018), 121-130. - Koji Aoyama and Fumiaki Kohsaka,
*Cutter mappings and subgradient projections in Banach spaces*, Linear and Nonlinear Analysis 3 (2017), no. 3, 457-473. - Koji Aoyama,
*Uniformly nonexpansive sequences*, Linear and Nonlinear Analysis 3 (2017), no. 2, 179-187. - Koji Aoyama and Masashi Toyoda,
*Approximation of zeros of accretive operators in a Banach space*, Israel Journal of Mathematics 220 (2017), 803-816. PDF (doi: 10.1007/s11856-017-1511-1) - Koji Aoyama,
*Viscosity approximation method for quasinonexpansive mappings with contraction-like mappings*, Nihonkai Mathematical Journal 27 (2016), 168-180. - Koji Aoyama and Fumiaki Kohsaka,
*Strongly relatively nonexpansive sequences generated by firmly nonexpansive like mapping*, Fixed Point Theory and Applications.2014, 2014:95, 13 pages. (doi: 10.1186/1687-1812-2014-95) - Koji Aoyama and Yasunori Kimura,
*Viscosity approximation methods with a sequence of contractions*, Cubo 16 (2014), no.1, 9-20. (doi: 10.4067/S0719-06462014000100002) - Koji Aoyama and Fumiaki Kohsaka,
*Viscosity approximation process for a sequence of quasinonexpansive mappings*, Fixed Point Theory and Applications.2014, 2014:17, 11 pages. (doi: 10.1186/10.1186/1687-1812-2014-17) - Koji Aoyama and Fumiaki Kohsaka,
*Uniform mean convergence theorems for hybrid mappings in Hilbert spaces*, Fixed Point Theory and Applications 2012, 2012:193, 13 pages. (doi: 10.1186/1687-1812-2012-193) - Koji Aoyama, Yasunori Kimura, and Fumiaki Kohsaka,
*Strong convergence theorems for strongly relatively nonexpansive sequences and applications*, Journal of Nonlinear Analysis and Optimization: Theory & Applications 3 (2012), no.1, 67-77. - Koji Aoyama and Fumiaki Kohsaka,
*Fixed point theorem for $\alpha$-nonexpansive mappings in Banach spaces*, Nonlinear Analysis Series A: Theory, Methods & Applications 74 (2011), no.13, 4387-4391. (DOI: 10.1016/j.na.2011.03.057). - Koji Aoyama and Yasunori Kimura,
*Strong convergence theorems for strongly nonexpansive sequences*, Applied Mathematics and Computation 217 (2011), no. 19, 7537-7545. (DOI: 10.1016/j.amc.2011.01.092). - Koji Aoyama and Fumiaki Kohsaka,
*Fixed point and mean convergence theorems for a family of $\lambda$-hybrid mappings*, Journal of Nonlinear Analysis and Optimization: Theory & Applications 2 (2011), no.1, 87-95. - Koji Aoyama, Fumiaki Kohsaka, and Wataru Takahashi,
*Proximal point methods for monotone operators in Banach spaces*, Taiwanese Journal of Mathematics 15 (2011), no. 1, 259-281. - Koji Aoyama, Shigeru Iemoto, Fumiaki Kohsaka, and Wataru
Takahashi,
*Fixed point and ergodic theorems for $\lambda$-hybrid mappings in Hilbert spaces*, Journal of Nonlinear and Convex Analysis 11 (2010), no. 2, 335-343. - Koji Aoyama and Fumiaki Kohsaka,
*Existence of fixed points of firmly nonexpansive-like mappings in Banach spaces*, Fixed Point Theory and Applications 2010, Article ID 512751, 15 pages. Special Issue [Takahashi's Legacy in Fixed Point Theory]. - Koji Aoyama, Fumiaki Kohsaka, and Wataru Takahashi,
*Shrinking projection methods for firmly nonexpansive mappings*, Nonlinear Analysis Series A: Theory, Methods & Applications Volume 71, Issue 12 (2009), e1626-e1632. (doi: 10.1016/j.na.2009.02.001) - Koji Aoyama, Fumiaki Kohsaka, and Wataru Takahashi,
*Strongly relatively nonexpansive sequences in Banach spaces and applications*, Journal of Fixed Point Theory and Applications 5 (2009), no. 2, 201-225. PDF - Koji Aoyama, Fumiaki Kohsaka, and Wataru Takahashi,
*Three generalizations of firmly nonexpansive mappings: Their relations and continuity properties*, Journal of Nonlinear and Convex Analysis 10 (2009), no. 1, 131-147. - Masanori Akatsuka, Koji Aoyama, and Wataru Takahashi,
*Mean ergodic theorems for a sequence of nonexpansive mappings in Hilbert spaces*, Scientiae Mathematicae Japonicae 68 (2008), no. 2, 233-239. - Koji Aoyama, Yasunori Kimura, and Wataru Takahashi,
*Maximal monotone operators and maximal monotone functions for equilibrium problems*, Journal of Convex Analysis 15 (2008), no. 2, 395-409. - Koji Aoyama, Yasunori Kimura, Wataru Takahashi, and Masashi
Toyoda,
*On a strongly nonexpansive sequence in Hilbert spaces*, Journal of Nonlinear and Convex Analysis 8 (2007), no. 3, 471-490. - Koji Aoyama and Wataru Takahashi,
*Strong convergence theorems for a family of relatively nonexpansive mappings in Banach spaces*, Fixed Point Theory 8 (2007), no.2, 143-160. - Koji Aoyama, Yasunori Kimura, Wataru Takahashi, and Masashi
Toyoda,
*Approximation of common fixed points of a countable family of nonexpansive mappings in a Banach space*, Nonlinear Analysis Series A: Theory, Methods & Applications 67 (2007), no. 8, 2350-2360. (DOI: 10.1016/j.na.2006.08.032) - Koji Aoyama and Wataru Takahashi,
*Weak convergence theorems by Ces\`aro means for a nonexpansive mapping and an equilibrium problem*, Pacific Journal of Optimization 3 (2007), no. 3, 501-509. - Koji Aoyama, Yasunori Kimura, Wataru Takahashi, and Masashi
Toyoda,
*Finding common fixed points of a countable family of nonexpansive mappings in a Banach space*, Scientiae Mathematicae Japonicae 66 (2007), no. 1, 89-99. - Koji Aoyama, Hideaki Iiduka, and Wataru Takahashi,
*Strong convergence of Halpern's sequence for accretive operators in a Banach space*, Panamerican Mathematical Journal 17 (2007), no. 3, 75-89. - Koji Aoyama, Hideaki Iiduka, and Wataru Takahashi,
*Weak convergence of an iterative sequence for accretive operators in Banach spaces*, Fixed Point Theory and Applications (2006), Art. ID 35390, 13. - Koji Aoyama,
*Inverse of the Berge maximum theorem in convex metric spaces*, Scientiae Mathematicae Japonicae 58 (2003), no. 3, 541-546.

- Koji Aoyama,
*Approximation of fixed points of nonexpansive mappings and quasinonexpansive mappings in a Hilbert space*, in Proceedings of the 10th International Conference on Nonlinear Analysis and Convex Analysis, Yokohama Publishers, 2019, pp. 1-10. - Koji Aoyama,
*Strongly quasinonexpansive mappings*, in Proceedings of the 9th International Conference on Nonlinear Analysis and Convex Analysis, Yokohama Publishers, 2016, pp. 19-27. - Koji Aoyama,
*Approximations to solutions of the variational inequality problem for inverse-strongly-monotone mappings*, in Proceedings of 7th international conference on Nonlinear Analysis and Convex Analysis -I-, Yokohama Publishers, 2013, pp. 1-9. - Koji Aoyama and Yasunori Kimura,
*A note on the hybrid steepest descent methods*, in Proceedings of The 10th International Conference on Fixed Point Theory and its Applications, House of the Book of Science Cluj-Napoca, Romania, 2013, pp. 73-80. - Koji Aoyama,
*Asymptotic fixed points of sequences of quasi-nonexpansive type mappings*, in Proceedings of the International Symposium on Banach and Function Spaces III, Yokohama Publishers, 2011, pp. 343-350. - Koji Aoyama,
*Halpern's iteration for a sequence of quasinonexpansive type mappings*, in Nonlinear Mathematics for Uncertainty and Its Applications (Advances in Intelligent and Soft Computing), Springer-Verlag, 2011, pp. 387-394. PDF - Koji Aoyama,
*An iterative method for a variational inequality problem over the common fixed point set of nonexpansive mappings*, Proceedings of the 6th International Conference on Nonlinear Analysis and Convex Analysis, Yokohama Publishers, 2010, pp. 21-28. - Koji Aoyama,
*An iterative method for fixed point problems for sequences of nonexpansive mappings*, Proceedings of The 9th International Conference on Fixed Point Theory and its Applications, Yokohama Publishers, 2010, pp. 1-7. - Koji Aoyama, Fumiaki Kohsaka, and Wataru Takahashi,
*Strong convergence theorems for a family of mappings of type (P) and applications*, Proceedings of Asian Conference on Nonlinear Analysis and Optimization, Yokohama Publishers, 2009, pp.1-17. - Koji Aoyama, Fumiaki Kohsaka, and Wataru Takahashi,
*Strong convergence theorems by shrinking and hybrid projection methods for relatively nonexpansive mappings in Banach spaces*, Proceedings of the 5th International Conference on Nonlinear Analysis and Convex Analysis, Yokohama Publishers, 2009, pp. 7-26. - Koji Aoyama, Yasunori Kimura, Wataru Takahashi, and Masashi
Toyoda,
*Strongly nonexpansive sequences and their applications in Banach spaces*, Proceedings of the 8th International Conference on Fixed Point Theory and Its Applications, Yokohama Publishers, 2008, pp. 1-18. - Koji Aoyama, Kazutaka Eshita, and Wataru Takahashi,
*Iteration processes for nonexpansive mappings in convex metric spaces*, Proceedings of the 4th International Conference on Nonlinear Analysis and Convex Analysis, Yokohama Publishers, 2007, pp. 31-39. - Koji Aoyama,
*A survey: An inverse of the Berge maximum theorem*, Proceedings of the 3rd International Conference on Nonlinear Analysis and Convex Analysis, Yokohama Publishers, 2004, pp. 1-8.

- Koji Aoyama and Masashi Toyoda,
*Fixed point theorem for a Meir-Keeler type mapping in a metric space with a transitive relation*, arXiv:2012.14121 [math.FA]. - Koji Aoyama and Masashi Toyoda,
*Approximation of common fixed points of strongly nonexpansive sequences in a Banach space*, arXiv:1804.10757 [math.FA] . - Koji Aoyama,
*Approximation of fixed points of nonexpansive mappings and quasinonexpansive mappings in a Hilbert space*, arXiv:1709.08901 [math.FA] . - Koji Aoyama and Kei Zembayashi,
*Strongly quasinonexpansive mappings, II*, arXiv:1703.02218 [math.FA]. - Koji Aoyama, Yasunori Kimura, and Fumiaki Kohsaka,
*Strong convergence theorems for strongly relatively nonexpansive sequences and applications*, arXiv:1202.1628 [math.FA]. - Koji Aoyama and Yasunori Kimura,
*A note on the hybrid steepest descent methods*, arXiv:1101.0881 [math.FA].

- Koji Aoyama,
*Approximation of common fixed points of a sequence of nonexpansive mappings*, Workshop on Convex Analysis and Optimization, Tokai University, Kanagawa, Japan, December 24, 2019. - Koji Aoyama,
*Approximation of zeros of accretive operators in a Banach space*, The 10th international conference on Nonlinear Analysis and Convex Analysis,

Chitose City Cultural Center Hokkaido, Chitose, Japan, July 4-9, 2017. - Koji Aoyama,
*Uniformly nonexpansive sequences*, The fifth Asian conference on Nonlinear Analysis and Optimization,

Toki Messe Niigata Convention Center, Niigata, Japan, August 1-6, 2016. - Koji Aoyama,
*Approximation method for the variational inequality problems over the fixed point sets of quasinonexpansive mappings*, The ninth international conference on Nonlinear Analysis and Convex Analysis,

Rimkok Resort Hotel, Chiang Rai, January 21-25, 2015. - Koji Aoyama,
*Viscosity approximation process for a sequence of quasinonexpansive mappings*, The Fourth Asian Conference on Nonlinear Analysis and Optimization,

National Taiwan Normal University, Taipei, Taiwan, August 5-9, 2014. - Koji Aoyama,
*Viscosity approximation methods with a sequence of contractions*, International Conference on Nonlinear Analysis and Optimization,

National Sun Yat-sen University, Kaohsiung, Taiwan, December 20-22, 2013. - Koji Aoyama,
*Strong convergence theorems for strongly relatively nonexpansive sequences and applications*, The eighth international conference on Nonlinear Analysis and Convex Analysis,

Hirosaki University, Hirosaki, Aomori, JAPAN on August 2-6, 2013. - Koji Aoyama,
*Existence of fixed points of firmly nonexpansive-like mappings in Banach spaces*, International Conference on the Theory, Methods and Applications of Nonlinear Equations, Texas A&M University-Kingsville, Kingsville, Texas, USA, December 17-21, 2012. - Koji Aoyama,
*Strong convergence theorems for strongly nonexpansive sequences in Hilbert spaces*, The Third Asian Conference on Nonlinear Analysis and Optimization, Kunibiki Messe, Matsue, Shimane, Japan, September 2-6, 2012. - Koji Aoyama,
*Fixed point and mean convergence theorems for hybrid mappings*, The 10th International Conference on Fixed Point Theory and its Applications, Babes-Bolyai University, Cluj-Napoca, Romania, July 9-15, 2012. - Koji Aoyama,
*Halpern's iteration for a sequence of quasinonexpansive type mappings*, International Conference on Nonlinear Mathematics for Uncertainty and Its Applications, Beijing University of Technology, Beijing, China, September 7-9, 2011. - Koji Aoyama,
*On the hybrid steepest descent method*, The 7th International Conference on Nonlinear Analysis and Convex Analysis, Pukyong National University, Busan, Republic of Korea, August 2-5, 2011. - Koji Aoyama,
*Convergence theorems for relatively nonexpansive mappings in Banach spaces*, The Second Asian Conference on Nonlinear Analysis and Optimization, Royal Paradise Hotel & Spa, Patong beach, Phuket, Thailand, September 9-12, 2010. - Koji Aoyama,
*Approximation methods for a countable family of nonexpansive mappings*, The Third International Symposium on Banach and Function Spaces, Kyushu Institute of Technology, Tobata Campus, Kitakyushu, Japan, September 14-17, 2009. - Koji Aoyama,
*On a strongly nonexpansive sequence in Banach spaces*, The Ninth International Conference on Fixed Point Theory and Its Applications, National Changhua University of Education, Changhua, Taiwan, July 16-22, 2009. - Koji Aoyama,
*Maximal monotone operators and equilibrium problems*, The Sixth International Conference on Nonlinear Analysis and Convex Analysis, Tokyo Institute of Technology, Tokyo, Japan, March 27-31, 2009. - Koji Aoyama,
*Strongly nonexpansive sequences and their applications*, Asian Conference on Nonlinear Analysis and Optimization, Kunibiki Messe, Matsue, Japan, September 14-17, 2008. - Koji Aoyama,
*Strongly nonexpansive sequences and their applications*, The Fifth World Congress of Nonlinear Analysts, Hyatt Grand Cypress Resort, Orlando, Florida, USA, July 2-9, 2008. - Koji Aoyama and Wataru Takahashi,
*Convergence theorems for a nonexpansive mapping and an equilibrium problem in Hilbert spaces*, The Japan-Thailand joint seminar on fixed point algorithms in optimization, Tokyo Institute of Technology, Tokyo, Japan, September 6-7, 2007. - Koji Aoyama, Yasunori Kimura, Wataru Takahashi and Masashi Toyoda,
*Approximation of common fixed points of a family of nonexpansive mappings in a Banach space*, The eighth international conference on fixed point theory and its applications, Chiang Mai University, Chiang Mai, Thailand, July 16-22, 2007. - Koji Aoyama and Wataru Takahashi,
*Strong convergence theorems for a family of relatively nonexpansive mappings in Banach spaces*, The fifth international conference on nonlinear analysis and convex analysis, National Tsing-Hua University, Hsinchu, Taiwan, May 30-June 4, 2007. - Koji Aoyama,
*A sufficient condition for Nash equilibria in $N$-person games over reflexive Banach spaces*, The fourth international conference on nonlinear analysis and convex analysis, Okinawa Convention Center, Okinawa, Japan, June 30-July 4, 2005. - Koji Aoyama,
*An inverse of the Berge maximum theorem*, The eighth international conference on nonlinear functional analysis and applications, Kyungnam University and Gyeongsang National University, Masan and Chinju, Korea, August 9-13, 2004. - Koji Aoyama,
*Inverse of the Berge maximum theorem in convex metric spaces*, The third international conference on nonlinear analysis and convex analysis, Tokyo Institute of Technology, Tokyo, Japan, August 25-29, 2003.