http://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/30015/1/tsusetu_p165-207.pdf

http://eprints.lib.hokudai.ac.jp/dspace/handle/2115/157/browse?type=type&value=bulletin&sort_by=2&order=ASC&rpp=20&etal=15&submit_browse=Update