@article{1103842225, author = {Ernest, John}, title = {The enveloping algebra of a covariant system}, journal = {Comm. Math. Phys.}, volume = {16}, number = {1}, year = {1970}, pages = { 61-74}, language = {en}, url = {http://dml.mathdoc.fr/item/1103842225} }
Ernest, John. The enveloping algebra of a covariant system. Comm. Math. Phys., Tome 16 (1970) no. 1, pp. 61-74. http://gdmltest.u-ga.fr/item/1103842225/