A note on a paper by Andreotti and Hill concerning the Hans Lewy problem
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 2 (1975) no. 4, pp. 557-569. 
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Stormark, Olle. A note on a paper by Andreotti and Hill concerning the Hans Lewy problem. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 2 (1975) no. 4, pp. 557-569. http://archive.numdam.org/item/ASNSP_1975_4_2_4_557_0/

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