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Tuleu, C., Basit, A.W., Waddington , W.A., Ell, P.J. and Newton, J.M. (2002) Colonic delivery of 4-aminosalicylic acid using amylose-ethycellulose coated hydroxyproplymethyl cellulose capsules. Alimentary Pharmacology and Therapeutics, 16 . pp. 1771-1779. 10.1046/j.1365-2036.2002.01327.x.