info:oai:orgprints.org:4352info:ofi/fmt:xml:xsd:bookFriedPadruot M.Fried, Padruot M.ZihlmannUrsZihlmann, UrsStrasserFrediStrasser, FrediTschachtliRuediTschachtli, RuediAmmannHelmutAmmann, HelmutDuboisDavidDubois, David2005How economic is organic? Results of a long-term trial at Burgrain/Lucerne, Switzerlandproceeding