@article{MAT_1965_9_2_a6,
     author = {W. Littman and G. Stampacchia and H. F. Weinberger},
     title = {Regular points for elliptic equations with discontinuous coefficients},
     journal = {Matematika},
     pages = {72--97},
     year = {1965},
     volume = {9},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1965_9_2_a6/}
}