1. Chapter 47 Pharmacotherapy of Inflammatory Bowel Disease(2011) inGoodman & Gilman's The Pharmacological Basis of Therapeutics 12thedn McGraw‐Hill London pp.1351–1362.
2. Parke Davis (1959) US 2 916 485 USA‐prior.1959.
3. Pfizer (1959) US 2 895 876 USA‐prior.1954.