@article{1183506230,
author = {Birkhoff, Garrett},
title = {Subdirect unions in universal algebra},
journal = {Bull. Amer. Math. Soc.},
volume = {50},
number = {12},
year = {1944},
pages = { 764-768},
language = {en},
url = {http://dml.mathdoc.fr/item/1183506230}
}
Birkhoff, Garrett. Subdirect unions in universal algebra. Bull. Amer. Math. Soc., Tome 50 (1944) no. 12, pp. 764-768. http://gdmltest.u-ga.fr/item/1183506230/