?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=VIAN%2C+Ph+D+Jean+Fran%C3%83%C2%A7ois&rft.aulast=VIAN&rft.aufirst=Jean+Fran%C3%83%C2%A7ois&rft.date=2006&rft.title=Spatial+variability+of+microbial+indicators+and+assessment+of+tillage+systems+on+the+soil+microbiological+functioning+on+organic+farming.&rft.genre=proceeding