@article{DAN_1988_298_2_a8,
     author = {V. A. Yakubovich},
     title = {Absolute stability of nonlinear systems with a periodically},
     journal = {Doklady Akademii Nauk},
     pages = {299--303},
     publisher = {mathdoc},
     volume = {298},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_298_2_a8/}
}