@article{DAN_1960_131_6_a12,
     author = {A. S. Schwarz},
     title = {Stability of stationary values},
     journal = {Doklady Akademii Nauk},
     pages = {1276--1278},
     publisher = {mathdoc},
     volume = {131},
     number = {6},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_131_6_a12/}
}