@article{bwmeta1.element.bwnjournal-article-fmv30i1p5bwm,
author = {Tibor Rad\'o},
title = {On the derivative of Lebesgue area of continuous surfaces},
journal = {Fundamenta Mathematicae},
volume = {30},
year = {1938},
pages = {34-39},
zbl = {0018.31402},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv30i1p5bwm}
}
Radó, Tibor. On the derivative of Lebesgue area of continuous surfaces. Fundamenta Mathematicae, Tome 30 (1938) pp. 34-39. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv30i1p5bwm/