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[文献書誌] Gibo Seiichi: "Residual,Peak and Fully Softened Strength of Materials in the Slip Surface Zone" Proc.the Japan-China Symposium on Landslide and Debris Flows,(Niigata,Tokyo)(The Japan Landslide Society). 25-28 (1989)
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[文献書誌] 宜保清一: "残留強度,完全軟化強度,ピ-ク強度と地すべり斜面の安定性評価" 地すべり学会関西支部シンポジウム“地すべりのC,φと発生・運動予測"(地すべり学会関西支部主催). 21-39 (1989)
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[文献書誌] 宜保清一,森英勇,赤嶺光宏,江頭和彦: "地すべり土の大変位せん断挙動と残留強度パラメ-タ" 第25回土質工学研究発表会(岡山)(土質工学会). (1990)
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[文献書誌] Gibo Seiichi,Sasaki Keizo: "A Simple Method for Evaluating the Stability of Slopes" “Alpine Landslide Practical Seminar"Sixth International Conference and Field Workshop on Landslides,(Milan). (1990)
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[文献書誌] 宜保清一,江頭和彦: "残留強度パラメ-タに及ぼす物理的化学的性質及び鉱物組成の影響" 土質工学会論文報告集. (1991)