1. Biochemical Pathways Wall Chart, ed. G. Michal, Boehringer Mannheim, Germany; now Roche also on the internet at: http://www.expasy.org/tools/pathways/
2. Chemoinformatics—A Textbook, ed. J. Gasteiger and T. Engel, Wiley-VCH, Weinheim, Germany, 2003
3. Handbook of Chemoinformatics, ed. J. Gasteiger, Wiley-VCH, Weinheim, Germany, 2003, 4 volumes
4. LIGAND: database of chemical compounds and reactions in biological pathways
5. The metabolic world of Escherichia coli is not small