1. Burger A (1983) A guide to the chemical basis of drug design. Wiley, New York
2. Sneader W (1990) Chronology of drug introductions. In: Hansch C, Sammes PG, Taylor JB (eds) Comprehensive medicinal chemistry. vol 1, Kennewell PD (ed). Pergamon, Oxford, pp 7–80
3. Verg E (1988) Meilensteine. 125 Jahre Bayer 1863–1988. Bayer AG, Leverkusen
4. Badio B et al (1994) Epibatidine: discovery and definition as a potent analgesic and nicotinic agonist. Med Chem Res 4:440–448 and other works (Special journal edition dedicated to Epibatidine)
5. Buss AD, Waigh RD (1995) Natural products as leads for new pharmaceuticals. In: Wolff M (ed) Burger’s medicinal chemistry and drug discovery. Wiley, New York, pp 983–1033