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@article{MOMA_1968__72_177416, author = {W.J. Schneider}, title = {An {Elementary} {Proof} of a {Theorem} of {MacLane.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {144--146}, publisher = {mathdoc}, volume = {72}, year = {1968}, zbl = {0165.40202}, url = {http://geodesic.mathdoc.fr/item/MOMA_1968__72_177416/} }
W.J. Schneider. An Elementary Proof of a Theorem of MacLane.. Monatshefte für Mathematik, Tome 72 (1968), pp. 144-146. http://geodesic.mathdoc.fr/item/MOMA_1968__72_177416/