Simandl, G.J. et al. 2018. Economic Geology Models 4. Tantalum and Niobium: Deposits, Resources, Exploration Methods and Market – A Primer for Geoscientists. Geoscience Canada. 45, 2 (Jul. 2018), 85–96. DOI:https://doi.org/10.12789/geocanj.2018.45.135.