1. N.P. Marigangaiah, K.K. Banerji, Indian J. Chem. 14A (1976) 660
2. A. Meenakshi, M. Santhappa, Indian J. Chem. 11 (1973) 393.
3. G.S. Sundaram, N. Venkatasubramanian, J. Chem. Soc. Perkin Trans 2 (1983) 949
4. J.P. Sharma, R.N.P. Singh, A.K. Singh, B. Singh, Tetrahedron 42 (1986) 2739
5. R. Ramachandrappa, M. Puttaswamy, S.M. Mayanna, N.M. Made Gowda, Int. J. Chem. Kinet. 30 (1998) 407