Lalezari, I.; Sharghi, N. J. Heterocyclic Chem., 1966 , vol. 3, p. 336 - 337 Full Text Show Details Gmelin Handbook: F: PerFHalOrg.1, 1.1.5.4, page 89 - 94 Full Text Show Details Farbenfabriken Bayer A. G. Patent: ZA6904818 , 1969 ; C.A., 1970 , vol. 73, p. 45515 Full Text Show Details Farbenfabriken Bayer A. G. Patent: DE1795037 , 1969 ;