1. Coulson's Valence;McWeeny,1979
2. Wavefunction. SPARTAN. Wavefunction, Inc., 18401 Von Karman, Suite 310, Irvine, California 92715
3. Autodesk. HyperChem. Autodesk, Inc., Scientific Modeling Division, 2320 Marinship Way, Sausalito, California 94965
4. CAChe. CAChe. CAChe Scientific, P.O. Box 500 M/S 13400, Beaverton, Oregon 97077
5. Cambridge Scientific Computing. Chem3D Plus 2.01. Cambridge Scientific Computing, Inc., 875 Massachusetts Avenue, Suite 41, Cambridge, Massachusetts 02139