@article{DAN_1973_213_5_a14,
     author = {I. M. Koval'chik},
     title = {Conditions for the solvability of linear equations in a function space},
     journal = {Doklady Akademii Nauk},
     pages = {1051--1054},
     publisher = {mathdoc},
     volume = {213},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_213_5_a14/}
}