1. 1. Lordi, N.G. (1987) Sustained release dosage forms. In: Lachman, L., Lieberman, H.A. and Kanig, J.L. (eds.) The theory and practice of industrial pharmacy, 3rd edn (Indian edn). Varghese Publishing House, Bombay, pp. 430–456.
2. 2. Chiao, C.S.L. and Robinson, J.R. (1995) Sustained-release drug delivery systems. In: Gennaro, A.R. (ed.) Remington: the science and practice of pharmacy, vol. II. Mack Publishing Company, Easton, PA, pp. 1660–1675.
3. 3. Kydonieus, A.F. (1890) Fundamental concepts of controlled release. In: Kydonieus, A.F. (ed.) Controlled release technologies: methods, theory, and applications, vol. I. CRC, Boca Raton, Florida, pp. 1–19.
4. U.S. Food and Drug Administration, Center for Drug Evaluation and Research, Drug Approval Reports.
http://www.accessdata.fda.gov/scripts/cder/drugsatfda/index.cfm?fuseaction=Reports.ReportsMenu.
5. GlaxoSmithKline. Our Histroy [see 1952, online].
http://www.gsk.com/about/histroy-noflash.htm.