@article{1077492639,
author = {Gleyzal, Andr\'e},
title = {Interval-functions},
journal = {Duke Math. J.},
volume = {8},
number = {1},
year = {1941},
pages = { 223-230},
language = {en},
url = {http://dml.mathdoc.fr/item/1077492639}
}
Gleyzal, André. Interval-functions. Duke Math. J., Tome 8 (1941) no. 1, pp. 223-230. http://gdmltest.u-ga.fr/item/1077492639/