no. 2
E. E. Levi convexity and the Hans Lewy problem. Part I : reduction to vanishing theorems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 26 (1972) no. 2, pp. 325-363. 
@article{ASNSP_1972_3_26_2_325_0,
     author = {Andreotti, Aldo and Denson Hill, C.},
     title = {E. E. Levi convexity and the Hans Lewy problem. Part I : reduction to vanishing theorems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {325--363},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 26},
     number = {2},
     year = {1972},
     mrnumber = {460725},
     language = {en},
     url = {archive.numdam.org/item/ASNSP_1972_3_26_2_325_0/}
}
Andreotti, Aldo; Denson Hill, C. E. E. Levi convexity and the Hans Lewy problem. Part I : reduction to vanishing theorems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 26 (1972) no. 2, pp. 325-363. http://archive.numdam.org/item/ASNSP_1972_3_26_2_325_0/

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