1. E. Sanders-Bush, S.E. Mayer, in: Goodman & Gilman's The Pharmacological Basis of Therapeutics, edtied by McGraw-Hill: New York, (1996), p.249.
2. J. Rodriguez, Feraud, M. Spec. Chem. Mag. Vol. 25 (2005), p.16.
3. D. Fernandez, A. Ahaidar, G. Danelon, P. Cironi, M. Marfil, O. Perez, C. Cuevas, F. Albericio, J.A. Joule, M. Alvarez, Monatsh. Chem. Vol. 135 (2004), p.615.
4. P.M. Fresneda, S. Delgado, A. Francesch, I. Manzanares, C. Cuevas, P. Molina, J. Med. Chem. Vol. 49 (2006) p.1217.
5. P. Beswick, R. Gleave,; M. Swarbrick, Patent WO 0169241, (2005).