@article{GDZPPN002385007,
title = {The identities of - and unique subdirect factorization within - classes of universal algebras.},
journal = {Mathematische Zeitschrift},
volume = {62},
year = {1955},
pages = {171-188},
zbl = {0064.26301},
url = {http://dml.mathdoc.fr/item/GDZPPN002385007}
}
Foster, Alfred L. The identities of - and unique subdirect factorization within - classes of universal algebras.. Mathematische Zeitschrift, Tome 62 (1955) pp. 171-188. http://gdmltest.u-ga.fr/item/GDZPPN002385007/