TY - JOUR AU - E. M. Il'in TI - Singularities of weak solutions of elliptic boundary value problems with discontinuous coefficients JO - Zapiski Nauchnykh Seminarov POMI PY - 1973 SP - 33 EP - 45 VL - 38 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ZNSL_1973_38_a3/ LA - ru ID - ZNSL_1973_38_a3 ER -