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@article{PORMA_1969__28_2_115083, author = {Bennet, Mary Katherine}, title = {A characterization of a category of discrete transformation groups}, journal = {Portugaliae mathematica}, pages = {71--73}, publisher = {mathdoc}, volume = {28}, number = {2}, year = {1969}, mrnumber = {0281773}, zbl = {0214.03104}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1969__28_2_115083/} }
Bennet, Mary Katherine. A characterization of a category of discrete transformation groups. Portugaliae mathematica, Tome 28 (1969) no. 2, pp. 71-73. http://geodesic.mathdoc.fr/item/PORMA_1969__28_2_115083/