Hidayat R, Azka CN, Fatimah A, Firmansyah TA. Subgrade Optimization with Coconut Shell Ash Addition on Glee Gurah Clay Soil. komposit [Internet]. 2025 Aug. 5 [cited 2025 Dec. 16];9(2):393-402. Available from: http://150.107.142.43/index.php/komposit/article/view/19087