Visit the page of AIST's site (National Institute of Advanced Industrial Science and Technology) below to access Sadajiro's papers.

https://staff.aist.go.jp/miyagi.iso14000/nkysdb/d9/f5/beaa48a50c777707928bfe3f785a685ab236.html
土田 定次郎 共著関連データベース (A list of literatures under single or joint authorship with Sadajiro Tsuchida.)

Please note that there are other papers that is not listed in the page above.