no. 2
Homogeneous Cauchy-Riemann structures
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 18 (1991) no. 2, pp. 193-212. 
@article{ASNSP_1991_4_18_2_193_0,
     author = {Kr\"uger, Andreas},
     title = {Homogeneous {Cauchy-Riemann} structures},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {193--212},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 18},
     number = {2},
     year = {1991},
     mrnumber = {1129301},
     zbl = {0787.32022},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1991_4_18_2_193_0/}
}
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Krüger, Andreas. Homogeneous Cauchy-Riemann structures. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 18 (1991) no. 2, pp. 193-212. http://www.numdam.org/item/ASNSP_1991_4_18_2_193_0/

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