中国科学院数学与系统科学研究院期刊网
The Scatter of Spectrum of Quadratic Operator Pencil and Nonnegative Infinite Dimensional Hamiltonian Operator
Li Gang XING, Alatancang
Acta Mathematica Sinica, Chinese Series . 2012, (4): 665 -672 .  DOI: 10.12386/A2012sxxb0063