@misc{oai:tsukuba.repo.nii.ac.jp:00010749,
 author = {劉, 群 and Liu, Qun},
 month = {},
 note = {1989, 【要旨】},
 title = {Effect of rapid oligotrophication on the phytoplankton community in a mesotrophic bog},
 year = {1990}
}