@article{DAN_1986_289_1_a4,
     author = {Yu. V. Egorov},
     title = {Removable singularities in boundary conditions for solutions of},
     journal = {Doklady Akademii Nauk},
     pages = {27--29},
     year = {1986},
     volume = {289},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_289_1_a4/}
}