@article{EJDE_2001__2001__a233,
     author = {Beilin,  Sergei A.},
     title = {Existence of solutions for one-dimensional wave equations with nonlocal conditions},
     journal = {Electronic journal of differential equations},
     year = {2001},
     volume = {2001},
     zbl = {0994.35078},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a233/}
}