@phdthesis{oai:tsukuba.repo.nii.ac.jp:00020820,
 author = {小池, 啓一 and Koike, Keiichi},
 month = {},
 note = {1979},
 school = {筑波大学, University of Tsukuba},
 title = {Comparative ultrastructural studies on the spermatozoa of the Prosobranchia (Mollusca: Gastropoda)},
 year = {1980}
}