Bernd Beck, Timothy Clark, Robert C. Glen VESPA: A new, fast approach to electrostatic potential-derived atomic charges from semiempirical methods. [Citation Graph (0, 0)][DBLP] Journal of Computational Chemistry, 1997, v:18, n:6, pp:744-756 [Journal]
Bernd Beck, Guntram Rauhut, Timothy Clark The Natural Atomic Orbital Point Charge Model for PM3: Multipole Moments and Molecular Electrostatic Potentials. [Citation Graph (0, 0)][DBLP] Journal of Computational Chemistry, 1994, v:15, n:10, pp:1064-1073 [Journal]