@article{MAN_1960__141_160794,
     author = {B. ECKMANN and P.J. HILTON},
     title = {Operators and {Cooperators} in {Homotopy} {Theory.}},
     journal = {Mathematische Annalen},
     pages = {1--21},
     publisher = {mathdoc},
     volume = {141},
     year = {1960},
     zbl = {0094.17301},
     url = {http://geodesic.mathdoc.fr/item/MAN_1960__141_160794/}
}