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@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/} }
B. ECKMANN; P.J. HILTON. Operators and Cooperators in Homotopy Theory.. Mathematische Annalen, Tome 141 (1960), pp. 1-21. http://geodesic.mathdoc.fr/item/MAN_1960__141_160794/