"Naoki Hamada,Shunsuke Ichiki","Free disposal hull condition to verify when efficiency coincides with weak efficiency",,"Journal of Optimization Theory and Applications",,"Volume 192","no. 1","  248--270",2022,Jan.
"Naoki Hamada,Shunsuke Ichiki","Simpliciality of strongly convex problems",,"Journal of the Mathematical Society of Japan",,"Vol. 73","No. 3","pp. 965--982",2021,July
"Naoki Hamada,Kenta Hayano,Shunsuke Ichiki,Yutaro Kabata,Hiroshi Teramoto","Topology of Pareto sets of strongly convex problems",,"SIAM Journal on Optimization",,"  30","  3","  2659--2686",2020,Sept.