Extraction of clavulanic acid using aqueous two-phase micellar system - Andrade, Evelyn Guedes de; Silva, Marcela de Siqueira Cardoso; Haga, Raquel Brandão; Santos, Valeria Carvalho dos; Pessoa Junior, Adalberto; Rangel-Yagui, Carlota de Oliveira (Biotechnology and Applied Biochemistry, 2011)