Variability associated with sample preparation procedures for aflatoxin analysis in peanuts - Calori-Domingues, Maria Antonia; Zovico, C.; Fonseca, Homero; Glória, Eduardo Micotti da; Barbin, Décio; Borguini, R. G. (International IUPAC Symposium on Mycotoxins and Phycotoxins, 2000)