info:oai:orgprints.org:7372info:ofi/fmt:xml:xsd:bookPommerescheReidunPommeresche, ReidunHansenSisselHansen, SisselEltunRagnarEltun, RagnarKorsaethAudunKorsaeth, Audun2006Long-term effects of cropping systems on the earthworm populations in a loam soil proceeding