@phdthesis{oai:tsukuba.repo.nii.ac.jp:00020823,
 author = {西山, 賢一 and Nishiyama, Kenichi},
 month = {},
 note = {2000, Includes bibliographical references},
 school = {筑波大学, University of Tsukuba},
 title = {Rates and mechanism of changing in rock properties due to weathering of sandstone gravel},
 year = {2000}
}