no. 4
On the propagation of singularities of semi-convex functions
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 4, pp. 597-616. 
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     title = {On the propagation of singularities of semi-convex functions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {597--616},
     publisher = {Scuola normale superiore},
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     zbl = {0874.49041},
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     url = {http://archive.numdam.org/item/ASNSP_1993_4_20_4_597_0/}
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Ambrosio, L.; Cannarsa, P.; Soner, H. M. On the propagation of singularities of semi-convex functions. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 4, pp. 597-616. http://archive.numdam.org/item/ASNSP_1993_4_20_4_597_0/

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