Chi, C. T., J. W. Geissman, T. Borgfeldt, and N. Hoang. “Paleomagnetism of Permian-Triassic Volcanic Sequences from Son La Province, Northwest Vietnam”. Vietnam Journal of Earth Sciences, vol. 43, no. 2, Mar. 2021, pp. 220-35, doi:10.15625/2615-9783/15943.