@article{TIMM_2003_9_2_a2,
     author = {Yu. F. Dolgii and A. V. Zakharov},
     title = {A~delay effect upon periodic oscillations in a~conservative system},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {21--40},
     year = {2003},
     volume = {9},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2003_9_2_a2/}
}