@article{GDZPPN002436426, title = {Positive Definite Functions on the Heisenberg Group.}, journal = {Mathematische Zeitschrift}, volume = {202}, year = {1989}, pages = {455-476}, zbl = {0702.43004}, url = {http://dml.mathdoc.fr/item/GDZPPN002436426} }
Jorgensen, Palle E.T. Positive Definite Functions on the Heisenberg Group.. Mathematische Zeitschrift, Tome 202 (1989) pp. 455-476. http://gdmltest.u-ga.fr/item/GDZPPN002436426/