@article{MAN_1963__150_161051,
     author = {B. ECKMANN and J.P. HILTON},
     title = {Group-Like {Structures} in {General} {Categories} {III-Primitive} {Categories.}},
     journal = {Mathematische Annalen},
     pages = {165--187},
     publisher = {mathdoc},
     volume = {150},
     year = {1963},
     zbl = {0115.01403},
     url = {http://geodesic.mathdoc.fr/item/MAN_1963__150_161051/}
}