by Chemical, Metallurgical, and Mining Society of South Africa.

by Chemical, Metallurgical, and Mining Society of South Africa.;

by Chemical, Metallurgical, and Mining Society of South Africa.

by South African Institute of Mining and Metallurgy (Johannesburg);

by Zhu Hongxi

by Institutul de Cercetări Metalurgice şi Miniere. <Bucureşti>.;

by Chemical, Metallurgical, and Mining Society of South Africa.; Chemical and Metallurgical Society of South Africa.;

by Chemical, Metallurgical, and Mining Society of South Africa.;