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- Ishihara, Y., Okada, K., Nishigawa, M., Ogawa, N., Horikawa, Y. and Kitamura, A. 2011. Estimating PPT data via CPT-based design method. Proceedings of the 3rd IPA International Workshop in Shanghai, Press-in Engineering 2011, pp. 84-94.
- Ishihara, Y., Nagayama, T. and Tagaya, K. 2010. Interpretation of PPT data for more efficient pile construction. Proceedings of the 11th International Conference on Geotechnical Challenges in Urban Regeneration, London, UK, CD, 8p.
- 石原行博, 尾川七瀬, 木下三郎, 多賀谷宏三. 2009. PPTデータに基づく土質分類および換算N値に関する研究. 最近のサウンディング技術と地盤評価シンポジウム発表論文集, 地盤工学会, pp. 85-90. / Ishihara, Y., Ogawa, N., Kinoshita, S. and Tagaya, K. 2009. Study on soil classification and converted N value based on PPT data. Proceedings of the Symposium on Recent Sounding Technologies and Subsurface Assessment, the Japanese Geotechnical Society, pp. 85-90. (in Japanese)
- Ishihara, Y., Ogawa, N., Horikawa, Y., Kinoshita, S., Nagayama, T., Kitamura, A. and Tagaya, K. 2009. Utilization of pile penetration test data for ground information. Proceedings of the 2nd IPA International Workshop in New Orleans, Press-in Engineering 2009, pp. 105-120.
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- Ishihara, Y. 2021. Development history of Silent Piler (part 3): development of PPTS. IPA Newsletter, Vol. 6, Issue 1, pp. 11-14.
- Okada, K. 2019. Expansion of the usage of estimation of ground information during press-in with augering. Report of 11th IPA Press-in Engineering Seminar in Tokyo 2019, IPA Newsletter, Vol. 4, Issue 4, pp. 29-30.
- Ogawa, N. 2019. Expansion of the usage of estimation of ground information during press-in with Standard Press-in Method. Report of 11th IPA Press-in Engineering Seminar in Tokyo 2019, IPA Newsletter, Vol. 4, Issue 4, pp. 30-31.
- Ishihara, Y. 2019. Use of press-in piling data for estimating subsurface information: IPA-TC2 technical material. Report of 11th IPA Press-in Engineering Seminar in Tokyo 2019, IPA Newsletter, Vol. 4, Issue 4, pp. 25-28.
