1. Yadav, S.K.; Singh, O.V.; Tandon, S.N.J Planar Chromatogr 1994,7, 75.
2. Bhushan, R.; Shrivastava, S.P.; Chauhan R.S.Anal. Lett 1985,18, 1549.
3. Cerrai, E.; Testa, C.J. Chromatogr. 1962,9, 216.
4. Phalke, P.N.; Sherikar, A.V.; Dhadke, P.M.Indian J. Chem. (Sect A) 1997,36(5), 446.
5. Hsia, H.C.; Chean, T.C.; Tsai, S.L.US Patent 5470553, 19951128.