He, C.; Qin, Y.; Stein, F.: Thermodynamic Assessment of the Fe–Al–Nb System with Updated Fe–Nb Description. Journal of Phase Equilibra and Diffusion 38 (5), pp. 771 - 787 (2017)
If manganese nodules can be mined in an environmentally friendly way, the critical metals needed for the energy transition could be produced with low CO2 emissions