@article{DE_1983_19_4_a33,
     author = {N. I. Gavrilov},
     title = {Letter to the editors: {{\textquotedblleft}On} the stability of solutions of a class of {Hamiltonian} systems with small changes of the function $H${\textquotedblright} {[Differentsial'nye} {Uravneniya} 18 (1982), no.~2, 219{\textendash}234; {MR} 83j:58047]},
     journal = {Differencialʹnye uravneni\^a},
     pages = {729},
     year = {1983},
     volume = {19},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_4_a33/}
}