Makoba, M., Botha, D. E., Rapoo, M. T., Szabó, L. Z., Shomana, T., Agachi, P. S. “A Review on Botswana Coal Potential from a Pyrolysis and Gasification Perspective”, Periodica Polytechnica Chemical Engineering, 65(1), pp. 80–96, 2021. https://doi.org/10.3311/PPch.12909