Nguyen, L. H., Van, H. T., Nguyen, Q. T., Nguyen, T. H., Nguyen, T. B. L., Pham, T. P. T., Le, T. H., Bui, M. H., Ho, V. T., Tilpo, O. H. J., Ivan Jimenez, M. G. S. and Ngo, T. M. (2020) “Removal of chromium from wastewater using paper waste sludge-derived hyrdrochar modified by naoh”, Vietnam Journal of Earth Sciences, 43(1), pp. 71–80. doi: 10.15625/0866-7187/15704.