Spangler, D L Bioavailability and multiple dose characteristics of a new sustained release theophylline tablet. [electronic resource] - Annals of allergy Dec 1980 - 355-9 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0003-4738 Subjects--Topical Terms: AdultBiological AvailabilityDose-Response Relationship, DrugHumansTheophylline--adverse effectsTime Factors