@article{EJDE_2014__2014__a103,
     author = {Tiryaki,  Aydin},
     title = {Sturm-Picone type theorems for second-order nonlinear elliptic differential equations},
     journal = {Electronic journal of differential equations},
     year = {2014},
     volume = {2014},
     zbl = {1304.35265},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a103/}
}