no. 4
Homogeneous CR-hypersurface-structures on spheres
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 4, pp. 513-525. 
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     author = {Lehmann, R. and Feldmueller, D.},
     title = {Homogeneous $CR$-hypersurface-structures on spheres},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {513--525},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 14},
     number = {4},
     year = {1987},
     mrnumber = {963488},
     zbl = {0658.32014},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1987_4_14_4_513_0/}
}
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Lehmann, R.; Feldmueller, D. Homogeneous $CR$-hypersurface-structures on spheres. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 4, pp. 513-525. http://www.numdam.org/item/ASNSP_1987_4_14_4_513_0/

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