@article{RSMUP_1975__53__15_0, author = {Iseki, Kiyoshi}, title = {Multi-valued contraction mappings in complete metric spaces}, journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova}, pages = {15--19}, publisher = {Seminario Matematico of the University of Padua}, volume = {53}, year = {1975}, zbl = {0328.54030}, mrnumber = {410715}, language = {en}, url = {http://archive.numdam.org/item/RSMUP_1975__53__15_0/} }
Iseki, Kiyoshi. Multi-valued contraction mappings in complete metric spaces. Rendiconti del Seminario Matematico della Università di Padova, Tome 53 (1975) , pp. 15-19. http://archive.numdam.org/item/RSMUP_1975__53__15_0/
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