Piotr Cieplak, James W. Caldwell, Peter A. Kollman Molecular mechanical models for organic and biological systems going beyond the atom centered two body additive approximation: aqueous solution free energies of methanol and N-methyl acetamide, nucleic acid base, and amide hydrogen bonding and chloroform/ [Citation Graph (0, 0)][DBLP] Journal of Computational Chemistry, 2001, v:22, n:10, pp:1048-1057 [Journal]