[1]Lan, T.T. et al. 2019. Research on fabrication of non-calcined geopolymer ceramics from kaolin Tung Ba, Vi Xuyen, Ha Giang. <i>Vietnam Journal of Earth Sciences</i>. 41, 4 (Aug. 2019), 388–402. DOI:https://doi.org/10.15625/0866-7187/41/4/14371.