Krey Pharmazie, 1958 , vol. 13, p. 619,621 Full Text Show Details Geigy A.G. Patent: DE947473 , 1954 ; Full Text Show Details Geigy Chem. Corp. Patent: US2820738 , 1954 ; Full Text Show Details Cavallini et al. Farmaco, Edizione Scientifica, 1955 , vol. 10, p. 710,719