K. R. Bulusu and Nawlakhe, W. G.,
“Defluoridation”. National Environmental Engineering Research Institute, NEERI, Nagpur, India, p. viii, 61 p., [7] p. pl.: 8 fig., 18 tab., 1992.
M. Allard,
“GEMS/WATER operational guide”. WHO Collaborating Centre on Surface and Ground Water Quality, Ottawa, Ont, Canada, p. 219 p.: fig., tab., 1992.