@article{SM_1976_29_1_a1,
     author = {V. P. Mikhailov},
     title = {On the boundary values of solutions of second-order elliptic equations},
     journal = {Sbornik. Mathematics},
     pages = {3--11},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1976},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1976_29_1_a1/}
}