1. R.R. William, R.E. Waterman, J.C. Keresztesy, E.R. Buchman, J. Am. Chem. Soc. 57, 536–537 (1935)
2. K. Taori, V.J. Paul, H. Luesch, J. Am. Chem. Soc. 130, 1806–1807 (2008)
3. R.S. Koti, G.D. Kolavi, V.S. Hegde, I.M. Khaji, Ind. J. Chem. 45, 1900–1904 (2006)
4. A. Geronikaki, I. Argyropoulou, P. Vicini, F. Zani, Arkivoc 6, 89–102 (2009)
5. A.K. Singh, G. Mishra, K. Jyoti, J. Appl. Pharm. Sci. 5, 44–49 (2011)