@article{DAN_1994_337_4_a2,
     author = {G. V. Lyakhovetskii},
     title = {Vekua{\textendash}Erd\'elyi{\textendash}Lowndes transformation operators},
     journal = {Doklady Akademii Nauk},
     pages = {442--446},
     year = {1994},
     volume = {337},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_337_4_a2/}
}