@article{DAN_1989_308_6_a9,
     author = {A. V. Pogorelov},
     title = {Loss of stability of conical shells under external pressure},
     journal = {Doklady Akademii Nauk},
     pages = {1322--1326},
     year = {1989},
     volume = {308},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_308_6_a9/}
}