no. 1-2
Regular points for elliptic equations with discontinuous coefficients
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 17 (1963) no. 1-2, pp. 43-77. 
@article{ASNSP_1963_3_17_1-2_43_0,
     author = {Littman, Walter and Stampacchia, Guido and Weinberger, H. F.},
     title = {Regular points for elliptic equations with discontinuous coefficients},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {43--77},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 17},
     number = {1-2},
     year = {1963},
     zbl = {0116.30302},
     mrnumber = {161019},
     language = {en},
     url = {archive.numdam.org/item/ASNSP_1963_3_17_1-2_43_0/}
}
Littman, W.; Stampacchia, G.; Weinberger, H. F. Regular points for elliptic equations with discontinuous coefficients. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 17 (1963) no. 1-2, pp. 43-77. http://archive.numdam.org/item/ASNSP_1963_3_17_1-2_43_0/

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