Electron Correlation in the Small Hubbard Model

Electron correlation in an extended Hubbard model

Electron correlations in the effective Hubbard model

Electron Correlations in the High-Dimension Hubbard Model

Self-consistent theory of electron correlation in the Hubbard model

Hubbard Model as a Simplest Model of Strong Electron Correlations

Local approach study of electron correlation effects in the Hubbard model