12th Symposium European Weed Research Society : Wageningen 2002, Papendal, Arnhem, The Netherlands 24 -27 june 2002 : Proceedings EWRS - Doorwerth (Holanda) EWRS Bookstore 2002 - 438 p. il. n. 21 cm ISBN: 9067546712 Subjects--Index Terms: Congresos Malezas