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@article{MM2_1991__70_1_155576, author = {Ulrich Knauer and Peter Normak}, title = {Hereditary endomorphism monoids of projective acts.}, journal = {Manuscripta mathematica}, pages = {133--144}, publisher = {mathdoc}, volume = {70}, number = {1}, year = {1991}, zbl = {0722.20049}, url = {http://geodesic.mathdoc.fr/item/MM2_1991__70_1_155576/} }
Ulrich Knauer; Peter Normak. Hereditary endomorphism monoids of projective acts.. Manuscripta mathematica, Tome 70 (1991) no. 1, pp. 133-144. http://geodesic.mathdoc.fr/item/MM2_1991__70_1_155576/