@article{SM_1986_55_2_a1,
     author = {Yu. A. Semenov},
     title = {Smoothness of generalized solutions of the equation $\widehat Hu=f$ and essential selfadjointness of the operator $\widehat H=-\sum_{i,j}\nabla_i a_{ij}\nabla_j+V$ with measurable coefficients},
     journal = {Sbornik. Mathematics},
     pages = {309--333},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1986_55_2_a1/}
}