Steyn, Wynand Jacobus Van der Merwe; Nokes, B.; Du Plessis, L.; Agacer, R.; Burmas, N.; Popescu, L.(Transportation Research Board of the National Academies, 2015-06)
Mahlaba, Jabulani S.; Kearsley, Elsabe P.; Kruger, Richard A.(University of Kentucky Center for Applied Energy Research and the American Coal Ash Association, 2012)