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@article{MM2_1987__58_155208, author = {Alfredo Brega and Juan Tirao}, title = {K-Invariants in the universal enveloping algebra of the {Desitter} {Group.}}, journal = {Manuscripta mathematica}, pages = {1--36}, publisher = {mathdoc}, volume = {58}, year = {1987}, zbl = {0636.17004}, url = {http://geodesic.mathdoc.fr/item/MM2_1987__58_155208/} }
Alfredo Brega; Juan Tirao. K-Invariants in the universal enveloping algebra of the Desitter Group.. Manuscripta mathematica, Tome 58 (1987), pp. 1-36. http://geodesic.mathdoc.fr/item/MM2_1987__58_155208/