Evaluation of the diffusion coefficient for controlled for release of oxytetracycline from alginate/chitosan/poly(ethylene glycol) microbeads in simulated gastrointestinal environments - Cruz, Maria C Pinto; Ravagnani, Sergio Persio; Brogna, Fabio M S; Campana Filho, Sergio Paulo; Triviño, Galo Cardenas; Lisboa, Antonio C Luz; Mei, Lucia H Innocentini (Biotechnology and Applied Biochemistry, 2004)