@article{DAN_1987_293_6_a15,
     author = {S. I. Kavkyanov},
     title = {Empirical estimates for the smoothness of the solutions of linear},
     journal = {Doklady Akademii Nauk},
     pages = {1353--1357},
     publisher = {mathdoc},
     volume = {293},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_6_a15/}
}