@article{EJDE_2004__2004__a7,
     author = {Xu,  Xian},
     title = {Multiple sign-changing solutions for some m-point boundary-value problems},
     journal = {Electronic journal of differential equations},
     year = {2004},
     volume = {2004},
     zbl = {1058.34013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a7/}
}