@article{EJDE_2013__2013__a23,
     author = {Djebali,  Smail and Saifi,  Ouiza and Zahar,  Samira},
     title = {Singular boundary-value problems with variable coefficients on the positive half-line},
     journal = {Electronic journal of differential equations},
     year = {2013},
     volume = {2013},
     zbl = {1293.34030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2013__2013__a23/}
}