2024-03-28T08:56:54Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/560802019-03-18T10:23:56Zhdl_2115_55881hdl_2115_45005hdl_2115_116ON ABELIAN EXTENSIONS OF SIMPLE RINGSKishimoto, Kazuo410北海道大学Departmental Bulletin Paperapplication/pdfhttp://hdl.handle.net/2115/56080https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/56080/1/JFSHIU_20_N1-2_053-078.pdf2189-3187Journal of the Faculty of Science Hokkaido University. Ser. 1 Mathematics201-20530781967engpublisher