@article{DE_2006_42_6_a15,
     author = {L. Z. Fishman},
     title = {A study of a pendulum-type delay equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {850--851},
     publisher = {mathdoc},
     volume = {42},
     number = {6},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_6_a15/}
}