Anuar, Muhammad Aidiel, and Sufizar Ahmad. “Producing Fertiliser for Bok Choy Using Waste From Silica Water Filter”. Research Progress in Mechanical and Manufacturing Engineering, vol. 6, no. 1, Sept. 2025, pp. 1-9, https://periodical.uthm.edu.my/index.php/rpmme/article/view/18771.