@article{ASNSP_1963_3_17_1-2_43_0,
     author = {Littman, W. and Stampacchia, G. and Weinberger, H. F.},
     title = {Regular points for elliptic equations with discontinuous coefficients},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {43--77},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 17},
     number = {1-2},
     year = {1963},
     mrnumber = {161019},
     zbl = {0116.30302},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1963_3_17_1-2_43_0/}
}