@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/