@article{ASCFM_1962__8_2_183_0, author = {Walker, A. G.}, title = {Geometry and cosmology}, journal = {Annales de la facult\'e des sciences de l'universit\'e de Clermont. Math\'ematiques}, pages = {183--187}, publisher = {UER de Sciences exactes et naturelles de l'Universit\'e de Clermont}, volume = {8}, number = {2}, year = {1962}, language = {en}, url = {http://www.numdam.org/item/ASCFM_1962__8_2_183_0/} }