Zhongkun Ouyang and Paul W. Mayne. (2020) Effective Stress Friction Angle of Normally Consolidated and Overconsolidated Intact Clays from Piezocone tests. <i>The Geotechnical Engineering Journal of the SEAGS & AGSSEA</i>, <i>51</i>(2), pp 111 116.Zhongkun Ouyang and Paul W. Mayne. "Effective Stress Friction Angle of Normally Consolidated and Overconsolidated Intact Clays from Piezocone tests". The Geotechnical Engineering Journal of the SEAGS & AGSSEA 51 (2020):pp 111 116.Zhongkun Ouyang and Paul W. Mayne. Effective Stress Friction Angle of Normally Consolidated and Overconsolidated Intact Clays from Piezocone tests. Southeast Asian Geotechnical Society:ม.ป.ท. 2020.