@article{EJDE_2000__2000__a122,
     author = {Carlson,  Robert},
     title = {Nonclassical {Sturm-Liouville} problems and {Schr\"odinger} operators on radial trees},
     journal = {Electronic journal of differential equations},
     year = {2000},
     volume = {2000},
     zbl = {0960.34070},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a122/}
}