@article{bwmeta1.element.bwnjournal-article-fmv44i1p103bwm,
author = {J. Ravetz},
title = {Derivate planes of continuous functions of two real variables},
journal = {Fundamenta Mathematicae},
volume = {44},
year = {1957},
pages = {103-114},
zbl = {0078.04702},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv44i1p103bwm}
}
Ravetz, J. Derivate planes of continuous functions of two real variables. Fundamenta Mathematicae, Tome 44 (1957) pp. 103-114. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv44i1p103bwm/