no. 1
On the approximation of elliptic operators with discontinuous coefficients
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 3 (1976) no. 1, pp. 121-137. 
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     title = {On the approximation of elliptic operators with discontinuous coefficients},
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     pages = {121--137},
     publisher = {Scuola normale superiore},
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     number = {1},
     year = {1976},
     mrnumber = {406020},
     zbl = {0339.35006},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1976_4_3_1_121_0/}
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Mc Connell, William H. On the approximation of elliptic operators with discontinuous coefficients. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 3 (1976) no. 1, pp. 121-137. http://archive.numdam.org/item/ASNSP_1976_4_3_1_121_0/

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