@misc{oai:tsukuba.repo.nii.ac.jp:00011109,
 author = {Mita, Hajime and 三田, 肇},
 month = {},
 note = {1999, 【要旨】},
 title = {Organic geochemical study of the Cretaceous/Tertiary boundary sediments at Kawaruppu, Hokkaido, Japan},
 year = {1999}
}