@article{GDZPPN002291932,
title = {Group-Like Structures in General Categories II-Equalizers, Limits, Lengths.},
journal = {Mathematische Annalen},
volume = {152},
year = {1963},
pages = {150-186},
zbl = {0115.01403},
url = {http://dml.mathdoc.fr/item/GDZPPN002291932}
}
ECKMANN, B.; HILTON, P.J. Group-Like Structures in General Categories II-Equalizers, Limits, Lengths.. Mathematische Annalen, Tome 152 (1963) pp. 150-186. http://gdmltest.u-ga.fr/item/GDZPPN002291932/