I. Kaliman and L. Slipchenko's parallel implementation of the Effective Fragment Potential (EFP) method
copied from cf-staging / libefpThe Effective Fragment Potential (EFP) method allows one to describe large molecular systems by replacing chemically inert part of a system by a set of Effective Fragments while performing regular ab initio calculation on the chemically active part. The LIBEFP library is a full implementation of the EFP method. It allows users to easily incorporate EFP support into their favourite quantum chemistry package. LIBEFP is interfaced to Q-Chem and Psi4 for QM/EFP calculations.