中国科学院数学与系统科学研究院期刊网
On the Spectra of Some Ordinary Differential Operators with Negative Exponential Coefficients
Zhan Kuan GUO(1),Jiong SUN(2)
Acta Mathematica Sinica, Chinese Series . 2003, (4): 639 -648 .  DOI: 10.12386/A2003sxxb0086