@article{DE_1999_35_10_a1,
     author = {V. V. Basov},
     title = {On the stability of the equilibrium position of a system of differential equations in the critical case of two purely imaginary and two zero roots of the characteristic equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1313--1318},
     publisher = {mathdoc},
     volume = {35},
     number = {10},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_10_a1/}
}