no. 2
One dimensional symmetry in the Heisenberg group
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 30 (2001) no. 2, pp. 269-284. 
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     title = {One dimensional symmetry in the {Heisenberg} group},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {269--284},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 30},
     number = {2},
     year = {2001},
     mrnumber = {1895712},
     zbl = {1014.35019},
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     url = {http://www.numdam.org/item/ASNSP_2001_4_30_2_269_0/}
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Birindelli, Isabeau; Prajapat, Jyotshana. One dimensional symmetry in the Heisenberg group. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 30 (2001) no. 2, pp. 269-284. http://www.numdam.org/item/ASNSP_2001_4_30_2_269_0/

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