@article{EJDE_2005__2005__a28,
     author = {Yang,  Bo},
     title = {Positive solutions for the beam equation under certain boundary conditions},
     journal = {Electronic journal of differential equations},
     year = {2005},
     volume = {2005},
     zbl = {1075.34025},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a28/}
}