1. Boado, L., 1996. Microencapulación de complejos iónicos de terbutalina con ésteres de celulosa. Desarrollo de una formulación lı́quida de liberación controlada. PhD Thesis, University of Santiago de Compostela, Spain.
2. Preparation and characterization of microspheres containing the anti-inflammatory agents, indomethacin, ibuprofen and ketoprofen;Bodmeier;J. Controlled Release,1989
3. Ion exchange resins and sustained release;Borodkin,1993
4. Pediatric and geriatric aspects of pharmaceutics;Danish,1996
5. Ion-exchange resins;Deasy,1984