@article{bwmeta1.element.bwnjournal-article-fmv22i1p10bwm,
author = {J. Gillis},
title = {On Linearly Measurable Plane Sets of Points of Upper Density 1/2 },
journal = {Fundamenta Mathematicae},
volume = {23},
year = {1934},
pages = {57-69},
zbl = {60.0203.03},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv22i1p10bwm}
}
Gillis, J. On Linearly Measurable Plane Sets of Points of Upper Density ½. Fundamenta Mathematicae, Tome 23 (1934) pp. 57-69. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv22i1p10bwm/