1. An oral dosage form with extended, controlled delivery;Hesg,1981
2. Osmotic dispersing device for releasing beneficial agent;Theeuwes,1974
3. Therapeutic Systems;Heilmann,1978
4. Osmotically activated dosage forms for rate-controlled drug delivery;Eckenhoff;Pharm. Technol.,1981
5. Drug delivery systems;Theeuwes;Pharm. Ther.,1981