1. Kleemann, A.; Engel, J.; Kutschrer, B.; Reichert, D. in Pharmaceutical Substances: Syntheses, Patents, Applications, 3rd ed.; Georg Thieme: Verlag, Stuttgart, 1999.
2. Dollery, C., Ed. Therapeutic Drugs, 2nd ed.; Churchill Livingston: Edinburgh, 1999.
3. Graul, A.; Leeson, P. A.; Castaner, J. Drugs of the Future 2000, 25, 339–346.
4. Biedermann, P. U.; Stezowski, J. J.; Agranat, I. In Advances in Theoretically Interesting Molecules; Thummel, R. P. Ed.; JAI Press: Stamford, CN, 1998; Vol. 4, pp. 245–322.
5. Sadekov, I. D.; Minkin, V. I. Adv. Heterocycl. Chem. 1995, 63, 1–60.