Hofmann, Uwe (2002) Copper reduction and copper replacement - results and experiences of 12 years of on farm research. [Verrringerung der Kupferaufwandmenge und Kupferersatz - langjährige Erfahrungen in praktischen Betrieben.] 10th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing and Viticulture, Weinsberg / Germany, 04.02.2002 - 07.02.2002.