by Hammons, T.J., Blyden, B.K., Calitz, A.C., Gulstone, A.B., Isekemanga, E., Johnstone, R., Paluku, K., Simang, N.-N., Taher, F.
Published in IEEE transactions on energy conversion (01.12.2000)

by Calitz, A.C.
Published in Journal of energy in Southern Africa (01.11.1995)

by Hammons, T.J., Taher, F., Gulstone, A.B., Blyden, B.K., Johnston, R., Isekemanga, E., Paluku, K., Calitz, A.C., Simanga, N.N.
Published in IEEE power engineering review (01.01.1997)