Perwitasari, Dyah Suci, Yahya Ardian Yuma Pracesa, Muhammad Aji Pangestu, and Pardi Sampe Tola. 2021. “Langmuir and Freundlich Isotherm Approximation on Adsorption Mechanism of Chrome Waste by Using Tofu Dregs”. Nusantara Science and Technology Proceedings, November. Malang, Indonesia, 106-12. https://doi.org/10.11594/nstp.2021.1417.