Lan, Luu Thi Phuong, et al. “Correlation and High-Resolution Timing for Paleo-Tethys Permian-Triassic Boundary Exposures in Vietnam and Slovenia Using Geochemical, Geophysical and Biostratigraphic Data Sets”. Vietnam Journal of Earth Sciences, vol. 40, no. 3, June 2018, pp. 253-70, doi:10.15625/0866-7187/40/3/12617.