TY  - RPRT
TI  - Solution for the U-negative Hubbard superconductor including second-order correlation effects.
AU  - A Martín-Rodero
AU  - F Flores
PY  - 1992
DO  - 10.1103/physrevb.45.13008
UR  - https://pubmed.ncbi.nlm.nih.gov/10001367/
ID  - 10001367
ER  -