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@article{10_4064_ap_8_1_61_63, author = {C. Olech}, title = {A simple proof of a certain result of {Z.} {Opial}}, journal = {Annales Polonici Mathematici}, pages = {61--63}, publisher = {mathdoc}, volume = {8}, number = {1}, year = {1960}, doi = {10.4064/ap-8-1-61-63}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-8-1-61-63/} }
C. Olech. A simple proof of a certain result of Z. Opial. Annales Polonici Mathematici, Tome 8 (1960) no. 1, pp. 61-63. doi : 10.4064/ap-8-1-61-63. http://geodesic.mathdoc.fr/articles/10.4064/ap-8-1-61-63/
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