[2] Liang X T. Quantum fluctuations in mesoscopic resistance-inductance-capacitance electric circuits at finite temperature [J]. Chin. Phy., 2001, 10(6): 486-489

[5] Louisell W H. Quantum Statistical Properties of Radiation [M]. New York: John Wiley ,1973

[8] Umezawa H, Yamanaka Y. Micro, macro and thermal concepts in quantum field theory [J]. Advanced Phy., 1988,37(5): 531-557