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 
@article{ASNSP_1976_4_3_1_121_0,
     author = {Mc Connell, William H.},
     title = {On the approximation of elliptic operators with discontinuous coefficients},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {121--137},
     year = {1976},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 3},
     number = {1},
     mrnumber = {406020},
     zbl = {0339.35006},
     language = {en},
     url = {https://www.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. https://www.numdam.org/item/ASNSP_1976_4_3_1_121_0/

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