References
- Giger , R. , Rubinstein , R. and Ginsburg , D. 1973 . Tetrahedron , 29 : 2393
- Weissberger , A and Edward , C. 1973 . “ The Chemistry of Heterocyclic Compounds ” . Vol. 28 , 67 New York : John Wiley and Sons, Inc. .
- Ibid. , 276 2b
- Druey , J. and Marxer , A. 1959 . J.Med.Pharm.Chem. , 1 : 1
- Rama Rao , K . 1977 . Ph.D. Thesis , Hyderabad, , India : Osmania Univ. .