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@article{SF_1987__36_134903, author = {P. Normak}, title = {On equalizer-flat and pullback-flat acts.}, journal = {Semigroup forum}, pages = {293--314}, publisher = {mathdoc}, volume = {36}, year = {1987}, zbl = {0625.20058}, url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134903/} }
P. Normak. On equalizer-flat and pullback-flat acts.. Semigroup forum, Tome 36 (1987), pp. 293-314. http://geodesic.mathdoc.fr/item/SF_1987__36_134903/