@article{DAN_1988_299_6_a10,
     author = {E. V. Radkevich},
     title = {Conditions for the existence of a transition zone},
     journal = {Doklady Akademii Nauk},
     pages = {1323--1328},
     publisher = {mathdoc},
     volume = {299},
     number = {6},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_299_6_a10/}
}