N. Rugayah, Muladno, H. Nuraini, and Salundik, “Chicken Bone Charcoal for Defluoridation of Groundwater in Indonesia”, Int. J. Poult. Sci., vol. 13, no. 10, pp. 591–596, Sep. 2014, doi: 10.3923/ijps.2014.591.596.