[1]
G. J. Simandl, R. O. Burt, D. L. Trueman, and S. Paradis, “Economic Geology Models 4. Tantalum and Niobium: Deposits, Resources, Exploration Methods and Market – A Primer for Geoscientists”, GS, vol. 45, no. 2, pp. 85–96, Jul. 2018.