@article{EJDE_2006__2006__a131,
     author = {Cao,  Ting-Bin},
     title = {Complex oscillation of entire solutions of higher-order linear differential equations},
     journal = {Electronic journal of differential equations},
     year = {2006},
     volume = {2006},
     zbl = {1117.34082},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a131/}
}