@article{DAN_1957_114_6_a3,
     author = {M. A. Evgrafov and A. D. Solov'ev},
     title = {On a class of reversible operators in a ring of analytic functions},
     journal = {Doklady Akademii Nauk},
     pages = {1153--1154},
     publisher = {mathdoc},
     volume = {114},
     number = {6},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_114_6_a3/}
}