TY  - RPRT
TI  - Equations for the correlation functions using a generalized Keldysh technique.
AU  - SM Kogan
PY  - 1991
DO  - 10.1103/physreva.44.8072
UR  - https://pubmed.ncbi.nlm.nih.gov/9905960/
ID  - 9905960
ER  -