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@article{MZ_1988__199_1_173988, author = {Fulvio Ricci and Peter Sj\"ogren}, title = {Two-Parameter {Maximal} {Functions} in the {Heisenberg} {Group.}}, journal = {Mathematische Zeitschrift}, pages = {565--576}, publisher = {mathdoc}, volume = {199}, number = {1}, year = {1988}, zbl = {0638.42019}, url = {http://geodesic.mathdoc.fr/item/MZ_1988__199_1_173988/} }
Fulvio Ricci; Peter Sjögren. Two-Parameter Maximal Functions in the Heisenberg Group.. Mathematische Zeitschrift, Tome 199 (1988) no. 1, pp. 565-576. http://geodesic.mathdoc.fr/item/MZ_1988__199_1_173988/