G. H. A. Janaka J. Kumara, Kimitoshi Hayano, and Keita Ogiwara. “Image Analysis Techniques on Evaluation of Particle Size Distribution of Gravel”. GEOMATE Journal 3, no. 5 (September 29, 2012): 290–297. Accessed May 23, 2025. https://geomatejournal.com/geomate/article/view/1630.