@phdthesis{oai:tsukuba.repo.nii.ac.jp:00020809, author = {東城, 幸治 and Tojo, Koji}, month = {}, note = {1998}, school = {筑波大学, University of Tsukuba}, title = {The embryology of the mayfly Ephemera japonica McLachlan (Insecta: Ephemeroptera, Ephemeridae)}, year = {1999} }