@article{1103043336,
author = {Campbell, H. E.},
title = {On the Casimir operator.},
journal = {Pacific J. Math.},
volume = {7},
number = {4},
year = {1957},
pages = { 1325-1331},
language = {en},
url = {http://dml.mathdoc.fr/item/1103043336}
}
Campbell, H. E. On the Casimir operator.. Pacific J. Math., Tome 7 (1957) no. 4, pp. 1325-1331. http://gdmltest.u-ga.fr/item/1103043336/