Apte, S. C.; K.C. Bowles; W.A. Maher; R.E.W. Smith (July 2000). "MERCURY CYCLING IN LAKE MURRAY, PAPUA NEW GUINEA"(PDF). PEAK. Porgera, Papua New Guinea: Centre for Advanced Analytical Chemistry Energy Technology. Archived from the original(PDF) on 3 March 2012. Retrieved 15 March 2010.
Apte, S. C.; K.C. Bowles; W.A. Maher; R.E.W. Smith (July 2000). "MERCURY CYCLING IN LAKE MURRAY, PAPUA NEW GUINEA"(PDF). PEAK. Porgera, Papua New Guinea: Centre for Advanced Analytical Chemistry Energy Technology. Archived from the original(PDF) on 3 March 2012. Retrieved 15 March 2010.