1. 1) Japanese Geotechnical Society, “Geotechnical Engineering Practical Series 31; Survey, Design and Construction in Soil Improvement, pp.160-161 (2013).
2. 2) Japanese Geotechnical Society, “Soil freezing - theory and practice-“, Soil and Foundation Engineering Library 23, pp.249-306 (1995).
3. 3) T. Ohrai, ” Artificial ground freezing and its development”, Journal of the Japanese Society of Snow and Ice, Vol.59, No.3, pp.159-167(1997).
4. 4) S. Kinoshita, “Physics of freezing soil”, Morikita Publishing Co., Ltd., pp.133-151(1982).
5. 5) Publishing Committee, “Ground improvement in urban tunnel construction”, Tunnels and Underground, Vol. 45, No. 10, pp.45-50(2014).