@article{CTGDC_1977__18_3_271_0, author = {Van Osdol, D. H.}, title = {Principal homogeneous objects as representable functors}, journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle}, pages = {271--289}, publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS}, volume = {18}, number = {3}, year = {1977}, zbl = {0365.18002}, mrnumber = {506607}, language = {en}, url = {http://www.numdam.org/item/CTGDC_1977__18_3_271_0/} }