An example of the Heisenberg group
Journées équations aux dérivées partielles (1982), article no. 15, 3 p. 
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     author = {Elias M. Stein},
     title = {An example of the {Heisenberg} group},
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     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {15},
     pages = {1--3},
     publisher = {\'Ecole polytechnique},
     year = {1982},
     zbl = {0497.35069},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1982____A15_0/}
}
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Elias M. Stein. An example of the Heisenberg group. Journées équations aux dérivées partielles (1982), article  no. 15, 3 p. https://proceedings.centre-mersenne.org/item/JEDP_1982____A15_0/

[1] Folland and Stein : Comm. Pure and Applied Math. 27 (1974), 429-522. | MR | Zbl

[2] Greiner, Kohn and Stein : Proc. Nat. Acad. Sci. 72 (1975), 3287-3289. | MR | Zbl

[3] To appear.