@article{DE_1970_6_12_a5,
     author = {B. S. Kalitin},
     title = {The oscillations of a pendulum with a shock impulse. {II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2174--2181},
     publisher = {mathdoc},
     volume = {6},
     number = {12},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_12_a5/}
}