中国科学院数学与系统科学研究院期刊网
Zeros of Solutions of Higher Order Homogeneous Linear Differential Equations
Shuang Ting LAN, Zong Xuan CHEN
Acta Mathematica Sinica, Chinese Series . 2012, (3): 525 -534 .  DOI: 10.12386/A2012sxxb0049