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 
@article{ASNSP_1993_4_20_4_597_0,
     author = {Ambrosio, L. and Cannarsa, P. and Soner, H. M.},
     title = {On the propagation of singularities of semi-convex functions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {597--616},
     year = {1993},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 20},
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     zbl = {0874.49041},
     language = {en},
     url = {https://www.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. https://www.numdam.org/item/ASNSP_1993_4_20_4_597_0/

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