A Tribute to Professor Emeritus Horst Wagner: Researcher ...
Wagner, H.: Presidential Address: The challenge of deep-level mining in South Africa, Journal of the South African Institute of Mining and Metallurgy, 86(1986), No 9, pp 377–392 4 Porter, J.L.: Presidential Address: Are efforts to mechanize SA mines too focused on machinery rather than technology?, Journal of the Southern African Institute of ...