@article{1103841990, author = {Schmidt, B. G.}, title = {Discrete isotropies in a class of cosmological models}, journal = {Comm. Math. Phys.}, volume = {12}, number = {1}, year = {1969}, pages = { 329-336}, language = {en}, url = {http://dml.mathdoc.fr/item/1103841990} }
Schmidt, B. G. Discrete isotropies in a class of cosmological models. Comm. Math. Phys., Tome 12 (1969) no. 1, pp. 329-336. http://gdmltest.u-ga.fr/item/1103841990/