Influence of phosphate concentrations on glucoamylase production by aspergillus awamori in submerged culture - Zaldivar Aguero, Jesus Maria; Badino Junior, Alberto Colli; Vilaça, Patrícia Ribeiro; Facciotti, Maria Cândida Reginato; Schmidell Netto, Willibaldo (Brazilian Journal of Chemical Engineering, 1997)