HUNG*, Nguyen Huu; MINH, Nguyen Trung; HUNG, Doan Dinh; HUNG, Nguyen Ba. New discovery of late early ordovician graptolites and discussion on stratigraphic sequence of paleozoic sediments in the Dinh Ca - Trang Xa Section, Vo Nhai Disctrict, Thai Nguyen Province, Northeast Vietnam. Vietnam Journal of Earth Sciences, [S. l.], v. 39, n. 1, p. 76–86, 2017. DOI: 10.15625/0866-7187/39/1/9229. Disponível em: https://vjs.ac.vn/jse/article/view/9229. Acesso em: 21 may. 2025.