Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) NARITA KUNITOMO and YAMAGUCHI HAKUJU,Analysis of bearing capacity for log-spiral sliding surfaces.,SOILS AND FOUNDATIONS,0385-1621,The Japanese Geotechnical Society,1989,29,2,85-98,https://cir.nii.ac.jp/crid/1390001204611621632,https://doi.org/10.3208/sandf1972.29.2_85