Worku, A. “WINKLER’S SINGLE-PARAMETER SUBGRADE MODEL FROM THE PERSPECTIVE OF AN IMPROVED APPROACH OF CONTINUUM-BASED SUBGRADE MODELING”. Zede Journal of Ethiopian Engineers and Architects, vol. 26, Jan. 2023, pp. 11-22, http://ejol.aau.edu.et/index.php/ZEDE/article/view/6588.