E. A. R Dendo, A. R. Djamaluddin, T. Harianto, A. B. Muhiddin. “The Model Test of Hexagonal Grid Plate As Foundation Layer on Soft Soil”. Design Engineering, no. 1, Jan. 2023, pp. 1 - 15, http://thedesignengineering.com/index.php/DE/article/view/9744.