Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SUGIYAMA Motohiro and OKAWA Ryousuke and FUKUDA Kohji,Undrained Shear Strength of Clayey Soil Including some roots,Journal of the Japanese Society of Revegetation Technology,09167439,JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY,2006,32,1,215-218,https://cir.nii.ac.jp/crid/1390282680059774336,https://doi.org/10.7211/jjsrt.32.215