H. Niitsuma and S. Nagashima: "Development of a Wide Band Downhole Triaxial AE Sonde and its Calibration" Proceedings of 4th Domestic Conference on Subsurface and Civil Engineering Acoustic Emission (in Japanese). 75-84 (1991)
H. Niitsuma and S. Nagashima: "Development of a Wide Band Downhole Triaxial AE Sonde and its Calibration" Proceedings of 4th Domestic Conference on Subsurface and Civil Engineering Acoustic Emission (in Japanese). 75-84 (1991)
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H. Niitsuma 和 S. Nagashima：“宽带井下三轴声发射探空仪的开发及其校准”第四届国内地下与土木工程声发射会议论文集（日文）。
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