Sudjianto, Agus Tugas, Kabul Basah Suryolelono, Ahmad Rifa’i, and Indrasurya B Mochtar. “Behavior of Expansive Clay of Ngawi Region (East Java) Under Water Content Variation”. Civil Engineering Dimension 11, no. 2 (June 25, 2009): pp. 100-105. Accessed March 29, 2024. https://ced.petra.ac.id/index.php/civ/article/view/17225.