Sergio Perez Rodriguez, Numerical Modeling of Artisanal and Small-Scale Mining of Coltan in the African Great Lakes Region. journal = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology. November 2023, vol. 203(11). 147 - 150 [viewed 28 April 2024]. Available from: https://publications.waset.org/pdf/10013331.