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@article{IM_1982__69_142948, author = {E.M. Stein}, title = {An {Example} on the {Heisenberg} {Group} {Related} to the {Levy} {Operator.}}, journal = {Inventiones mathematicae}, pages = {209--216}, publisher = {mathdoc}, volume = {69}, year = {1982}, zbl = {0515.58032}, url = {http://geodesic.mathdoc.fr/item/IM_1982__69_142948/} }
E.M. Stein. An Example on the Heisenberg Group Related to the Levy Operator.. Inventiones mathematicae, Tome 69 (1982), pp. 209-216. http://geodesic.mathdoc.fr/item/IM_1982__69_142948/