"A process for denitrification of ground water",
Swainathan, K. and P. Lakshmanaperumalsamy, Bharathiar
University , Coimbatore - 641 046. Patent number 1433.DEL/2003,
Indian Patent office, New Delhi , 2003.
"Quaternized biomass as anion exchanger for
the removal of fluoride from water" Namasivayam,
C. and W.H. Hoell, Institute for Technical Chemistry,
Karlsruhe Research Centre, Karlsruhe, Germany, 2002
(Applied).
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