Development and validation of an HPLC/MS/MS method for the determination of sufentanil and morphine in human plasma - Manfio, Josélia Larger; Santos, Verônica Jorge; Lanchote, Vera Lúcia; Santos, Luciana Moraes dos; Carmona, Maria José Carvalho; Auler Júnior, José Otávio Costa; Brum Júnior, Liberato; Donaduzzi, Carmen Maria; Santos, Silvia Regina Cavani Jorge (Journal of AOAC International, 2011)