%0 Journal Article %A Shinji Yamashita %T Cluster sets of set-mappings %J Annales Polonici Mathematici %D 1977 %P 77-98 %V 35 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-35-1-77-98/ %R 10.4064/ap-35-1-77-98 %G en %F 10_4064_ap_35_1_77_98