1. CAS Registry, http://www.cas.org/expertise/cascontent/registry/index.html, last update 2007.
2. SAR—The U.S. Regulatory Perspective
3. ATSDR, 2005 CERCLA Priority List of Hazardous Substances, http://www.atsdr.cdc.gov/cercla/05list.html, last update 2006.
4. ‘Topological Indices and Related Descriptors in QSAR and QSPR’, Eds. J. Devillers, A. T. Balaban, Gordon and Breach Science Publishers, The Netherlands, 1999.