Nguyen, T. D., Nguyen, D. B. T. and Ta, H. D. (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), pp. 38–42. doi: 10.51316/jst.156.etsd.2022.32.1.6.