@article{GDZPPN00228992X,
title = {Group-Like Structures in General Categories I. Multiplications and Comultiplications.},
journal = {Mathematische Annalen},
volume = {146},
year = {1962},
pages = {227-255},
zbl = {0099.02101},
url = {http://dml.mathdoc.fr/item/GDZPPN00228992X}
}
ECKMANN, B.; HILTON, P.J. Group-Like Structures in General Categories I. Multiplications and Comultiplications.. Mathematische Annalen, Tome 146 (1962) pp. 227-255. http://gdmltest.u-ga.fr/item/GDZPPN00228992X/