Zhao, H. - In: The European Physical Journal B - Condensed Matter and … 54 (2006) 1, pp. 11-17
A simple formula for correlation energy E<Subscript>c</Subscript> of the π electron systems is obtained under an approximation for the electron-electron interactions. This formula is related directly to square of the bond order matrix and the nearest-neighbor Coulomb electron-electron interaction. The influence of...</subscript>