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@article{MZ_1989__201_4_174065, author = {Palle E.T. Jorgensen}, title = {Positive {Definite} {Functions} on the {Heisenberg} {Group.}}, journal = {Mathematische Zeitschrift}, pages = {455--476}, publisher = {mathdoc}, volume = {201}, number = {4}, year = {1989}, zbl = {0702.43004}, url = {http://geodesic.mathdoc.fr/item/MZ_1989__201_4_174065/} }
Palle E.T. Jorgensen. Positive Definite Functions on the Heisenberg Group.. Mathematische Zeitschrift, Tome 201 (1989) no. 4, pp. 455-476. http://geodesic.mathdoc.fr/item/MZ_1989__201_4_174065/