1. Draft ISRM suggested method for in situ stress measurement using the compact conical-ended borehole overcoring (CCBO) technique;Sugawara;Int J Rock Mech Min Sci,1999
2. Measurement of local stress and estimation of regional stress associated with stability assessment of an open-pit rock slope;Obara;Int J Rock Mech Min Sci,2000
3. Overcoring case study;Obara;Int J Rock Mech Min Sci,2003
4. Obara Y, Sugawara K. Characteristics of rock stress measured by stress relief method in Japan. In: Sharma and Saxena, editors. In situ characterization of rock. Oxford: IBH Publishing, 2002. p. 245–86.
5. Ishiguro Y, Nishimura H, Nishino K, Sugawara K. Rock stress measurement for design of underground powerhouse and considerations. Proceedings of the Second International Symposium on Rock Stress, Kumamoto, 1997. p. 491–8.