@article{EJDE_2002__2002__a30,
     author = {An,  Yukun},
     title = {Periodic solutions of a piecewise linear beam equation damping and nonconstant load},
     journal = {Electronic journal of differential equations},
     year = {2002},
     volume = {2002},
     zbl = {1015.35061},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a30/}
}