Oliveira, Marcos L.S, Frans Waanders, Luis F.O Silva, Andr Jasper, Carlos H Sampaio, Dursman McHabe, Rachel S Hatch, and James C Hower. 2011. “A Multi-Analytical Approach to Understand the Chemistry of Fe-Minerals in Feed Coals and Ashes.”
Coal Combustion and Gasification Products 3 (4): 51–62.
https://doi.org/10.4177/CCGP-D-11-00006.1.