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@article{PORMA_1987__44_1_115569, author = {Castillo, Jes\'us M.F.}, title = {An internal characterization of {G-spaces}}, journal = {Portugaliae mathematica}, pages = {63--67}, publisher = {mathdoc}, volume = {44}, number = {1}, year = {1987}, mrnumber = {0911833}, zbl = {0638.46005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1987__44_1_115569/} }
Castillo, Jesús M.F. An internal characterization of G-spaces. Portugaliae mathematica, Tome 44 (1987) no. 1, pp. 63-67. http://geodesic.mathdoc.fr/item/PORMA_1987__44_1_115569/