@article{DAN_1977_233_4_a12,
     author = {E. V. Radkevich},
     title = {The complex wave front in the problem of analyticity of solutions of linear partial differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {559--562},
     publisher = {mathdoc},
     volume = {233},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_233_4_a12/}
}