@article{EJDE_2007__2007__a25,
     author = {Denche,  Mohamed and Meziani,  Abderrahmane},
     title = {Boundary-value problems for second-order differential operators with nonlocal boundary conditions},
     journal = {Electronic journal of differential equations},
     year = {2007},
     volume = {2007},
     zbl = {1131.47044},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a25/}
}