Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SAKAGUCHI Kiyotoshi and TAKEDA Hideyuki and MATSUKI Koji,In-Situ Rock Stress Measurement using Improved Downward Compact Conical-Ended Borehole Overcoring Technique,Journal of MMIJ,18816118,The Mining and Materials Processing Institute of Japan,2010,126,7,418-424,https://cir.nii.ac.jp/crid/1390001205274267904,https://doi.org/10.2473/journalofmmij.126.418