Y. Obara

Evaluation of core disking rock stress and tensile strength via the compact conical-ended borehole overcoring technique

Seong Seung Kang, Y. Ishiguro, Y. Obara, 2006 .

Measuring rock stress: case examples of rock engineering in Japan

Y. Obara, K. Sugawara, 1993 .

Measurement of rock stress change by Cross-sectional Borehole Deformation Method ( CBDM )

Tatsuya Yokoyama, Takuya Shin, M. Ujihara, 2012 .

Draft ISRM suggested method for in situ stress measurement using the compact conical-ended borehole overcoring (CCBO) technique

Y. Obara, Y. Obara, K. Sugawara, 1999 .