TY  - RPRT
TI  - Extended Hubbard model in two dimensions.
AU  - Y Zhang
AU  - J Callaway
PY  - 1989
DO  - 10.1103/physrevb.39.9397
UR  - https://pubmed.ncbi.nlm.nih.gov/9947675/
ID  - 9947675
ER  -