,http://escholarship.lib.okayama-u.ac.jp/52049,10.18926/okadai-bun-kiyou/52049\n
 ,https://ousar.lib.okayama-u.ac.jp/53087,10.18926/okadai-bun-kiyou/53087\n
 ,https://ousar.lib.okayama-u.ac.jp/53734,10.18926/okadai-bun-kiyou/53734\n
 ,https://ousar.lib.okayama-u.ac.jp/52727,10.18926/okadai-bun-kiyou/52727\n
 ,http://escholarship.lib.okayama-u.ac.jp/54448,10.18926/okadai-bun-kiyou/54448\n