@article{DE_1971_7_10_a17,
     author = {R. E. Ginzburg},
     title = {An application of the method of {Ljapunov} functions to the investigation of oscillations in nonlinear systems with lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1903--1905},
     publisher = {mathdoc},
     volume = {7},
     number = {10},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_10_a17/}
}