Penney, KD & Mohamedelhassan, E 2011, 'Utilisation of coal/biomass fly ash in the control and treatment of acid mine drainage', in AB Fourie, M Tibbett & A Beersing (eds), Mine Closure 2011: Proceedings of the Sixth International Conference on Mine Closure, Australian Centre for Geomechanics, Perth, pp. 443-454, https://doi.org/10.36487/ACG_rep/1152_47_Penney
(https://papers.acg.uwa.edu.au/p/1152_47_Penney/)