Pointwise estimates for a class of strongly degenerate elliptic operators : a geometrical approach
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 4, pp. 527-568.
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     title = {Pointwise estimates for a class of strongly degenerate elliptic operators : a geometrical approach},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {527--568},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 14},
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     year = {1987},
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     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1987_4_14_4_527_0/}
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Franchi, B.; Serapioni, R. Pointwise estimates for a class of strongly degenerate elliptic operators : a geometrical approach. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 4, pp. 527-568. http://archive.numdam.org/item/ASNSP_1987_4_14_4_527_0/

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