Shukla, A J Effect of drug loading and molecular weight of cellulose acetate propionate on the release characteristics of theophylline microspheres. [electronic resource] - Pharmaceutical research Nov 1991 - 1396-400 p. digital Publication Type: Journal Article ISSN: 0724-8741 Standard No.: 10.1023/a:1015801207091 doi Subjects--Topical Terms: CapsulesCellulose--analogs & derivativesMicroscopy, Electron, ScanningMicrospheresMolecular WeightParticle SizeTheophylline--administration & dosageViscosity