1. Toxicology information from US government agencies
2. Brüggemann, R. and Halfon, E. (2000), “Introduction to the general principles of the partial order ranking theory”, in Sorensen, P.B. et al. Order Theoretical Tools in Environmental Sciences, Proceedings of the Second Workshop, 21 October, 1999, Roskilde, Denmark, NERI – Technical Report No. 318, Roskilde, National Environmental Research Institute, pp. 7‐44.
3. Chemometrics in Environmental Analysis
4. Cluster analysis and display of genome-wide expression patterns
5. Gale Group (2002), Gale Directory of Databases, available at: www.galegroup.com/pdf/facts/gdd.pdf