Nguyen, Trung Dung, Dang Binh Thanh Nguyen, and Hong Duc Ta. 2022. “Study on Theory of Separation Efficiency of Twin-Spiral Separator in a Grinding – Separation Apatite Process”. JST: Engineering And Technology For Sustainable Development 32 (1):38-42. https://doi.org/10.51316/jst.156.etsd.2022.32.1.6.