@article{SM_1983_46_3_a5,
     author = {Yu. A. Semenov},
     title = {Smoothness of generalized solutions of the equation $\biggl(\lambda-\displaystyle\sum_{i,j}\nabla_ia_{ij}\nabla_j\biggr)u=f$  with continuous coefficients},
     journal = {Sbornik. Mathematics},
     pages = {403--415},
     publisher = {mathdoc},
     volume = {46},
     number = {3},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_46_3_a5/}
}