Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) OKINO Bunkichi,Several problems on clay minerals and drilling muds,Journal of the Clay Science Society of Japan (in Japanese),04706455,The Clay Science Society of Japan,1977,17,4,177-189,https://cir.nii.ac.jp/crid/1390282679089398016,https://doi.org/10.11362/jcssjnendokagaku1961.17.177