Van Staden, C.J.; Van Der Westhuizen, D.(Journal for New Generation Sciences, Vol 11, Issue 2: Central University of Technology, Free State, Bloemfontein, 2013)
Venter, P.; Venter, T.; Luwes, N.; De Smidt, O.; Lues, J.F.R.(Journal for New Generation Sciences, Vol 11, Issue 1: Central University of Technology, Free State, Bloemfontein, 2013)
Van Blommestein, D.L.; Matope, S.; Ruthven, G.; Van der Merwe, A.F.(Journal for New Generation Sciences, Vol 11, Issue 3: Central University of Technology, Free State, Bloemfontein, 2013)
Page-Shipp, R.; Van Niekerk, C.(Journal for New Generation Sciences, Vol 11, Issue 2: Central University of Technology, Free State, Bloemfontein, 2013)
De Jager, L.; Ngole, V.M.; Ekosse, G.E.(Journal for New Generation Sciences, Vol 11, Issue 2: Central University of Technology, Free State, Bloemfontein, 2013)