中国科学院数学与系统科学研究院期刊网
Characterization of Self-adjoint Domains for the Product of Differential Expressions with an Interval Singular Point
GE Suqin, WANG Wanyi
Acta Mathematicae Applicatae Sinica . 2015, (2): 244 -253 .  DOI: 10.12387/C2015023