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@article{MS2_1978__42_166572, author = {Istv\'an Beck and Peter J. Trosborg}, title = {A note on free direct summands.}, journal = {Mathematica Scandinavica}, pages = {34--38}, publisher = {mathdoc}, volume = {42}, year = {1978}, zbl = {0382.16015}, url = {http://geodesic.mathdoc.fr/item/MS2_1978__42_166572/} }
István Beck; Peter J. Trosborg. A note on free direct summands.. Mathematica Scandinavica, Tome 42 (1978), pp. 34-38. http://geodesic.mathdoc.fr/item/MS2_1978__42_166572/