TY  - RPRT
TI  - Effective potential for quantum correlation functions.
AU  - A Cuccoli
AU  - V Tognetti
AU  - R Vaia
PY  - 1991
DO  - 10.1103/physreva.44.2734
UR  - https://pubmed.ncbi.nlm.nih.gov/9906257/
ID  - 9906257
ER  -