Pariser–Parr–Pople (PPP) method

https://doi.org/10.1351/goldbook.PT07088
A semi-empirical quantum mechanical method of calculation of the properties of conjugated molecules and ions from self-consistent-field theory and the π-electron approximation.
Source:
PAC, 1999, 71, 1919. (Glossary of terms used in theoretical organic chemistry) on page 1956 [Terms] [Paper]