@article{DE_2001_37_5_a4,
     author = {A. F. Izmailov},
     title = {On the {Andronov{\textendash}Hopf} {Bifurcation} {Theorem}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {609--615},
     year = {2001},
     volume = {37},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2001_37_5_a4/}
}