no. 3
Surfaces with assigned apparent contour
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 3, pp. 311-341. 
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     volume = {Ser. 4, 21},
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     zbl = {0844.57031},
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     url = {http://www.numdam.org/item/ASNSP_1994_4_21_3_311_0/}
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Luminati, Domenico. Surfaces with assigned apparent contour. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 3, pp. 311-341. http://www.numdam.org/item/ASNSP_1994_4_21_3_311_0/

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