1. Quantum second virial coefficient paradox
2. On the relation between classical and quantum statistical mechanics
3. An introduction to relativistic quantum field theory;Schweber,1961
4. W.O. Amrein, J.M. Jauch and K.B. Sinha, Scattering theory in quantum mechanics (Benjamin, New York) Proposition 4.3, p. 143.
5. Functional integration in quantum physics;Simon,1979