TY  - RPRT
TI  - Imaginary part in thermo field dynamics.
AU  - Y Fujimoto
AU  - M Morikawa
AU  - M Sasaki
PY  - 1986
DO  - 10.1103/physrevd.33.590
UR  - https://pubmed.ncbi.nlm.nih.gov/9956663/
ID  - 9956663
ER  -