On the Liouville property for sublaplacians
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 25 (1997) no. 1-2, p. 239-256 
@article{ASNSP_1997_4_25_1-2_239_0,
     author = {Capuzzo Dolcetta, Italo and Cutr\`\i , Alessandra},
     title = {On the Liouville property for sublaplacians},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 25},
     number = {1-2},
     year = {1997},
     pages = {239-256},
     zbl = {1042.35013},
     mrnumber = {1655517},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1997_4_25_1-2_239_0}
}

Capuzzo Dolcetta, Italo; Cutrì, Alessandra. On the Liouville property for sublaplacians. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 25 (1997) no. 1-2, pp. 239-256. http://www.numdam.org/item/ASNSP_1997_4_25_1-2_239_0/

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