@article{DAN_1965_161_5_a13,
     author = {V. M. Volosov and B. I. Morgunov},
     title = {On the estimation of oscillatory behaviour for certain {non-Hamiltonian} systems},
     journal = {Doklady Akademii Nauk},
     pages = {1048--1050},
     publisher = {mathdoc},
     volume = {161},
     number = {5},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_161_5_a13/}
}