TY  - RPRT
TI  - Mean-field (n,m)-cluster approximation for lattice models.
AU  - D ben-Avraham
AU  - J Köhler
PY  - 1992
DO  - 10.1103/physreva.45.8358
UR  - https://pubmed.ncbi.nlm.nih.gov/9906934/
ID  - 9906934
ER  -