1. Examination of natural gums as matrices for sustained-release of theophylline;Nakano;Chem. Pharm. Bull.,1984
2. Pharmaceutical controlledrelease tablets containing basic drugs having pH-independent drug release;Howard,1988
3. Sustained-release dilazep hydrochloride tablets containing sodium alginate;Seiyaku,1989
4. Retarded-release drug tablet with alginic acidsodium alginate matrix;Viernstein,1988
5. Sustained release tablet;Christenson,1962