@article{GDZPPN002227835,
title = {K-Invariants in the universal enveloping algebra of the Desitter Group.},
journal = {Manuscripta mathematica},
volume = {58},
year = {1987},
pages = {1-36},
zbl = {0636.17004},
url = {http://dml.mathdoc.fr/item/GDZPPN002227835}
}
Brega, Alfredo; Tirao, Juan. K-Invariants in the universal enveloping algebra of the Desitter Group.. Manuscripta mathematica, Tome 58 (1987) pp. 1-36. http://gdmltest.u-ga.fr/item/GDZPPN002227835/