@phdthesis{oai:tsukuba.repo.nii.ac.jp:00008539,
 author = {富川, 昭男},
 month = {},
 note = {1994},
 school = {筑波大学, University of Tsukuba},
 title = {土壌腐植酸の粒子量および粒子量別画分の特性},
 year = {1994}
}