1. C.O. Kappe, D. Dallinger, Nat. Rev. Drug Discovery 5, 51 (2006)
2. A.K. Nagariya, A.K. Meena, A.K. Kiran, A.K. Yadav, U.S. Niranjan, A.K. Pathak, B. Singh, M.M. Rao, J. pharm. Res. 3(3), 575 (2010)
3. K.S. Jignasa, T.S. Ketan, S.P. Bhumika, K.G. Anuradha, Der Pharm. Chem. 2(1), 342 (2010)
4. E.V. Ratushnaya, Y.I. Kirova, M.A. Suchkov, B.I. Drevko, V.B. Borodulin, Pharm. Chem. J. 36(12), 652 (2002)
5. C. Jacob, G. Giles, F. Fry, US Pat 2004, wo 200 4047925.