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Retno Sari and M. Agus Syamsur Rijal and Dian Maya Sari and Ima Dewi Ruliyana (2012) Physical Characterization And In Vitro Release Study On Theophylline-Chitosan Microparticles (Effect On Crosslinking Time And Method Of Preparation). PharmaScientia, 1 (1). pp. 11-15. ISSN 2302-0725