1. Tungsten supply – Where does the future lie?;Merriman,2013
2. H. Mohrbacher, Q. Zhai, Niobium alloying in grey cast iron for vehicle brake discs, in: Proceedings of Materials Science & Technology Conference, October 16–20, 2011, Columbus, OHIO, ASM Int., 434–445.
3. T. Nylén, Niobium in cast iron, in: Proceedings of the International Symposium “Niobium Science and Technology”, 2001, Orlando, TMS, 2001, ISBN 0–9712068-0–5, 1063–1080
4. R. Edwards, T. Raine, The solid solubility of some stable carbides in cobalt nickel and iron at 1250°C, Pulvermetallurgie, Springerverlag (1952) 232–242
5. Systems of niobium monocarbide with transition metals;Guha;J. Less-Common Met,1972