@article{1103841728, author = {Gheorghe, Cezar and Mihul, Eleonora}, title = {Causal groups of space-time}, journal = {Comm. Math. Phys.}, volume = {12}, number = {1}, year = {1969}, pages = { 165-170}, language = {en}, url = {http://dml.mathdoc.fr/item/1103841728} }
Gheorghe, Cezar; Mihul, Eleonora. Causal groups of space-time. Comm. Math. Phys., Tome 12 (1969) no. 1, pp. 165-170. http://gdmltest.u-ga.fr/item/1103841728/