@article{DAN_1966_166_6_a11,
     author = {A. B. Shabat},
     title = {An analog of the {Rado--Cartan} theorem for solutions of elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {1304--1307},
     publisher = {mathdoc},
     volume = {166},
     number = {6},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_166_6_a11/}
}