1. Rational Design of oral modified-release drug delivery systems In Developing oral dosage forms;Qiu,2009
2. Understanding design and development of modified release solid oral dosage forms.;Qiu;J Validation Tech,2001
3. Delayed, sustained-release diltiazem pharmaceutical preparation.;Cobb;United States Patent,1996
4. Diltiazem formulation.;Baltezor;United States Patent,1994
5. Biphasic release formations for lipophilic acids.;Barnwell;Patent,1995