1. V.K. Sharma, J. Hussain, H.F. Khorakiwala, US Patent 6635277 — Composition for pulsatile delivery of diltiazem and process of manufacture. October 21, 2003. Available at: http://www.patentstorm.us/patents/6635277/description.html. Accessed on 13 January 2009.
2. Controlled-release multi-units and single unit doses. A literature review;Bechgaard;Drug Dev. Ind. Pharm.,1978
3. Tableting of coated pellets;Bodmeier;Eur. J. Pharm. Biopharm.,1997
4. Biopharmaceutical aspects of multiparticulates;Krämer,1994
5. Pellets: a general overview;Ghebre-Sellassie,1989