@phdthesis{oai:tsukuba.repo.nii.ac.jp:00008271,
 author = {坪井, 明人 and Tsuboi, Akito},
 month = {},
 note = {1984},
 school = {筑波大学, University of Tsukuba},
 title = {Independent partitions and the number of countable models},
 year = {1985},
 yomi = {ツボイ, アキト}
}