@article{oai:repository.dl.itc.u-tokyo.ac.jp:00000490, author = {Okayasu, T. and Takeuchi, K.}, issue = {5}, journal = {Journal of environmental information science}, month = {}, note = {application/pdf}, pages = {63--70}, title = {Classification of the size distribution of soil aggregates in arid and semi-arid regions in East Asia}, volume = {32}, year = {2004} }