@article{EJDE_2013__2013__a71,
     author = {Bal,  Kaushik},
     title = {Generalized {Picone's} identity and its applications},
     journal = {Electronic journal of differential equations},
     year = {2013},
     volume = {2013},
     zbl = {1288.35210},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2013__2013__a71/}
}