@article{DE_2006_42_10_a8,
     author = {Q-Heung Choi and Hunan Xu},
     title = {Nonlinear oscillations for the one-dimensional wave equation with a jump nonlinearity},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1380--1388},
     publisher = {mathdoc},
     volume = {42},
     number = {10},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_10_a8/}
}