@article{1103899002, author = {Borchers, H. J. and Sen, R. N.}, title = {Relativity groups in the presence of matter}, journal = {Comm. Math. Phys.}, volume = {40}, number = {1}, year = {1975}, pages = { 101-126}, language = {en}, url = {http://dml.mathdoc.fr/item/1103899002} }
Borchers, H. J.; Sen, R. N. Relativity groups in the presence of matter. Comm. Math. Phys., Tome 40 (1975) no. 1, pp. 101-126. http://gdmltest.u-ga.fr/item/1103899002/