Pancreatic islet isolation by mechanical-enzymatic separation, stationary collagenase digestion and dextran discontinuous density gradient purification: experimental study in dogs - Waisberg, Jaques; Soares, Heloisa Prado; Altieri, Luis Gustavo; Ramaciotti, Osiris; Speranzini, Manlio Basilio (Acta Cirúrgica Brasileira, 2002)