Nattawut Chaimananun. (2010) The study of cat-litter preparation from phosphogypsum with paper and coconut coir /. King Mongkut's University of Technology Thonburi,:ม.ป.ท.Nattawut Chaimananun. 2010. The study of cat-litter preparation from phosphogypsum with paper and coconut coir /. ม.ป.ท.:King Mongkut's University of Technology Thonburi,;Nattawut Chaimananun. The study of cat-litter preparation from phosphogypsum with paper and coconut coir /. ม.ป.ท.:King Mongkut's University of Technology Thonburi, 2010. Print.