Gradient estimates for a new class of degenerate elliptic and parabolic equations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 21 (1994) no. 4, p. 497-522 
@article{ASNSP_1994_4_21_4_497_0,
     author = {Lieberman, Gary M.},
     title = {Gradient estimates for a new class of degenerate elliptic and parabolic equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 21},
     number = {4},
     year = {1994},
     pages = {497-522},
     zbl = {0839.35018},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1994_4_21_4_497_0}
}

Lieberman, Gary M. Gradient estimates for a new class of degenerate elliptic and parabolic equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 21 (1994) no. 4, pp. 497-522. http://www.numdam.org/item/ASNSP_1994_4_21_4_497_0/

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