中国科学院数学与系统科学研究院期刊网
Invariant Subspaces of a Class of Second-Order Quadratic Differential Operators with Variable Coefficients and Their Applications
Chun Rong, ZHU Yin Li WU
Acta Mathematica Sinica, Chinese Series . 2016, (5): 595 -608 .  DOI: 10.12386/A2016sxxb0055