@article{1077490633,
author = {Ore, Oystein},
title = {Structures and group theory. II},
journal = {Duke Math. J.},
volume = {4},
number = {1},
year = {1938},
pages = { 247-269},
language = {en},
url = {http://dml.mathdoc.fr/item/1077490633}
}
Ore, Oystein. Structures and group theory. II. Duke Math. J., Tome 4 (1938) no. 1, pp. 247-269. http://gdmltest.u-ga.fr/item/1077490633/