Dalvi, Ashok D.; Bacon, W. Gordon; Osborne, Robert C. The Past and the Future of Nickel Laterites(PDF) (报告). PDAC 2004 International Convention, Trade Show & Investors Exchange. March 7–10, 2004 [April 17, 2010]. (原始内容(PDF)存档于2009-11-04).
Dalvi, Ashok D.; Bacon, W. Gordon; Osborne, Robert C. The Past and the Future of Nickel Laterites(PDF) (报告). PDAC 2004 International Convention, Trade Show & Investors Exchange. March 7–10, 2004 [April 17, 2010]. (原始内容(PDF)存档于2009-11-04).