M. Y, Hardiman. “The Comparison of Engineering Properties Between Single and Double Layer Porous Asphalt Made of Packing Gradation”. Civil Engineering Dimension 10, no. 2 (December 11, 2008): pp. 82–88. Accessed October 4, 2025. https://ced.petra.ac.id/index.php/civ/article/view/16859.