@article{DAN_1965_164_5_a0,
     author = {S. Kh. Aranson},
     title = {Systems on a torus with structural instability of the first degree},
     journal = {Doklady Akademii Nauk},
     pages = {959--962},
     publisher = {mathdoc},
     volume = {164},
     number = {5},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_164_5_a0/}
}