1. Calibration of effective van der Waals atomic contact radii for proteins and peptides
2. Protein Data Bank Chemistry Department, Bldg. 555, Brookhaven National Laboratory, P.O. Box 5000, Upton, NY 11973-5000 USA.
3. SYBYL, Tripos Associates, Inc., 1699 S. Hanley Road, Suite 303, St. Louis, MO 63144.
4. Constrained search of conformational hyperspace
5. 3D QSAR in Drug Design: Theory, Methods and Applications;Marshall,1993