C. J. Hawkesworth, Cohen, A. S., Cooper, M., Lightfoot, P. C., and O. Burnham, M., “Significant differences in the ore forming processes at Sudbury and Noril'sk; constraints from Os isotopes”, in AGU 1997 fall meeting, vol. 78, American Geophysical Union, Washington, DC, United States, 1997, p. 809.

• Google Scholar