@article{DE_1995_31_10_a21,
     author = {E. P. Volokitin and S. A. Treskov},
     title = {On the behavior of {Lyapunov} quantities of a complex focus for systems that are close to a system with a nilpotent linear part},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1759--1761},
     publisher = {mathdoc},
     volume = {31},
     number = {10},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_10_a21/}
}