@article{MAT_1958_2_6_a3,
     author = {D. Gilbarg and J. Serrin},
     title = {On isolated singularities of second order elliptic differential equations},
     journal = {Matematika},
     pages = {63--86},
     publisher = {mathdoc},
     volume = {2},
     number = {6},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1958_2_6_a3/}
}