A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
Zenjiro HOKAO. "Mutual Effect on the Stress Distrubution Around the Two Parallel Excavted Circular Tunnels." Journal of the Mining and Metallurgical Institute of Japan 75.856 (1959) 899-905