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@article{PORMA_1967__26_3_115042, author = {Kasahara, Shouro}, title = {A generalization of a theorem of {Polak}}, journal = {Portugaliae mathematica}, pages = {385--387}, publisher = {mathdoc}, volume = {26}, number = {3}, year = {1967}, mrnumber = {0256341}, zbl = {0191.53202}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_3_115042/} }
Kasahara, Shouro. A generalization of a theorem of Polak. Portugaliae mathematica, Tome 26 (1967) no. 3, pp. 385-387. http://geodesic.mathdoc.fr/item/PORMA_1967__26_3_115042/