Nagao, T., and R. Tsutaba. “Evaluation Methods of Vertical Subgrade Reaction Modulus and Rotational Resistance Moment for Seismic Design of Embedded Foundations”. Engineering, Technology & Applied Science Research 11, no. 4 (August 21, 2021): 7386–7392. Accessed May 17, 2022. https://etasr.com/index.php/ETASR/article/view/4269.