• Wald, A., et al.: J. Clin. Gastroenterol., 36, 386 (1953)
• Schmidt, et al.: Arzneim.-Forsch., 3, 19 (1953)
• Schultz, O.E. et al., Arch. Pharm. (Weinheim, Ger.), 1955, 288, 234, (synth, pharmacol)
• Rubinstein, K. et al., Acta Chem. Scand., 1958, 12, 1274, (synth)
• Negwer, M., Organic-Chemical Drugs and their Synonyms, 6th edn., Akademie-Verlag, 1987, 6443
• Sund, R.B., Norv. Pharm. Acta, 1983, 45, 125, (rev)
• Bruzzese, T. et al., Farmaco, Ed. Sci., 1973, 28, 121, (props)
• Martindale, The Extra Pharmacopoeia, 31st edn., Pharmaceutical Press, 1996, 1205-120
• Schmidt, L. et al., Arzneim.-Forsch., 1953, 3, 19; 1956, 6, 22, (pharmacol)