@article{GDZPPN002061902,
title = {Bicartesian Squares of Nilpotent Groups.},
journal = {Commentarii mathematici Helvetici},
volume = {50},
year = {1975},
pages = {477-492},
zbl = {0325.20031},
url = {http://dml.mathdoc.fr/item/GDZPPN002061902}
}
Mislin, Guido; Hilton, Peter. Bicartesian Squares of Nilpotent Groups.. Commentarii mathematici Helvetici, Tome 50 (1975) pp. 477-492. http://gdmltest.u-ga.fr/item/GDZPPN002061902/