@article{10_4064_ap97_2_2,
     author = {Hong-Yan Xu and Cai-Feng Yi},
     title = {Zeros of solutions of certain higher order linear
differential equations},
     journal = {Annales Polonici Mathematici},
     pages = {123--136},
     publisher = {mathdoc},
     volume = {97},
     number = {2},
     year = {2010},
     doi = {10.4064/ap97-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap97-2-2/}
}