@article{bwmeta1.element.bwnjournal-article-smv33i1p17bwm,
author = {B. Pettis},
title = {On Nikaid\^o's proof of the invariant mean-value theorem},
journal = {Studia Mathematica},
volume = {32},
year = {1969},
pages = {193-196},
zbl = {0179.47003},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv33i1p17bwm}
}
Pettis, B. On Nikaidô's proof of the invariant mean-value theorem. Studia Mathematica, Tome 32 (1969) pp. 193-196. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv33i1p17bwm/