@article{EJDE_2011__2011__a69,
     author = {Vrabel,  Robert},
     title = {A priori estimates for solutions to a four point boundary value problem for singularly perturbed semilinear differential equations},
     journal = {Electronic journal of differential equations},
     year = {2011},
     volume = {2011},
     zbl = {1211.34019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a69/}
}