1. Aldrich Catalog Handbook of Fine Chemicals, 1996. Aldrich. Milwaukee, WI
2. ampac 5.0. 1994. Semichem, 7128 Summit. Shawnee, KS
3. Bonchev, D., 1983. Information Theoretical Indices for Characterization of Chemical Structure. Wiley-Interscience, New York
4. codessa 2.0, 1994. University of Florida. Gainesville, FL
5. AM1: a new general purpose quantum mechanical molecular model;Dewar;J. Am. Chem. Soc.,1985