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@article{MZ_1995__219_2_174782, author = {Lars H\"ormander}, title = {Symplectic classification of quadratic forms, and general {Mehler} formulas.}, journal = {Mathematische Zeitschrift}, pages = {413--450}, publisher = {mathdoc}, volume = {219}, number = {2}, year = {1995}, zbl = {0829.35150}, url = {http://geodesic.mathdoc.fr/item/MZ_1995__219_2_174782/} }
Lars Hörmander. Symplectic classification of quadratic forms, and general Mehler formulas.. Mathematische Zeitschrift, Tome 219 (1995) no. 2, pp. 413-450. http://geodesic.mathdoc.fr/item/MZ_1995__219_2_174782/