@article{bwmeta1.element.bwnjournal-article-apmv8i1p61bwm,
author = {Olech, C.},
title = {A simple proof of a certain result of Z. Opial},
journal = {Annales Polonici Mathematici},
volume = {8},
year = {1960},
pages = {61-63},
zbl = {0089.27404},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-apmv8i1p61bwm}
}
Olech, C. A simple proof of a certain result of Z. Opial. Annales Polonici Mathematici, Tome 8 (1960) pp. 61-63. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-apmv8i1p61bwm/