EPMM

[-]epmm

This keyword combines numerical evaluation of the exact Coulomb integral for the short-range with the Buckingham type multipole approximation for the long-range, to evaluate intermolecular electrostatic energies.

"Combination of the exact potential and multipole methods (EP/MM) for evaluation of intermolecular electrostatic interaction energies with pseudoatom representation of molecular electron densities."
Anatoliy Volkov, T. Koritsanszky, Philip Coppens
Chem. Phys. Lett. 2004, 391, 170-175.