no. 1
New CR invariants and their application to the CR equivalence problem
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 24 (1997) no. 1, pp. 193-203. 
@article{ASNSP_1997_4_24_1_193_0,
     author = {Barletta, Elisabetta and Dragomir, Sorin},
     title = {New $CR$ invariants and their application to the $CR$ equivalence problem},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {193--203},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 24},
     number = {1},
     year = {1997},
     zbl = {0904.32006},
     mrnumber = {1475776},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1997_4_24_1_193_0/}
}
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Barletta, Elisabetta; Dragomir, Sorin. New $CR$ invariants and their application to the $CR$ equivalence problem. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 24 (1997) no. 1, pp. 193-203. http://www.numdam.org/item/ASNSP_1997_4_24_1_193_0/

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