@article{1103841577,
author = {Cattaneo, U.},
title = {Irreducible Lie algebra extensions of the Poincar\'e algebra. I. Extensions with abelian kernels},
journal = {Comm. Math. Phys.},
volume = {12},
number = {1},
year = {1969},
pages = { 226-245},
language = {en},
url = {http://dml.mathdoc.fr/item/1103841577}
}
Cattaneo, U. Irreducible Lie algebra extensions of the Poincaré algebra. I. Extensions with abelian kernels. Comm. Math. Phys., Tome 12 (1969) no. 1, pp. 226-245. http://gdmltest.u-ga.fr/item/1103841577/