?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=S%C3%A1enz+Sanz%2C+Clemente&rft.aulast=S%C3%A1enz+Sanz&rft.aufirst=Clemente&rft.title=Geological+patterns+in+the+collapse+of+certain+rock+sanctuaries+of+Spain&rft.btitle=Preservation+of+Natural+Stone+and+Rock+Weathering%3A+Proceedings+of+the+ISRM+Workshop+W3%2C+Madrid%2C+Spain%2C+14+July+2007&rft.date=2007&rft.isbn=978-0-415-45018-8&rft.tpages=5&rft.genre=proceeding