@article{DAN_1957_116_6_a14,
     author = {N. E. Martyanov},
     title = {Extension regions in the {Earth's} shell},
     journal = {Doklady Akademii Nauk},
     pages = {949--951},
     publisher = {mathdoc},
     volume = {116},
     number = {6},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_116_6_a14/}
}