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Swanepoel, C.M., Rötter, R.P., van der Laan, M., Annandale, J.G., Beukes, D.J., du Preez, C.C., Swanepoel, L.H., van der Merwe, A., and Hoffmann, M.P.

Sandhage-Hofmann, A., Kotzé, E., van Delden, L., Dominiak, M., Fouché, H.J., van der Westhuizen, H.C., Oomen, R.J., du Preez, C.C., and Amelung, W.

Swanepoel, P.A., du Preez, C.C., Botha, P.R., Snyman, H.A., and Habig, J.

Kotzé, E., Sandhage-Hofmann, A., Meinel, J.-A., du Preez, C.C., and Amelung, W.

Ng Cheong, L.R., Ng Kee Kwong, K.F., Ah Koon, P.D., and Du Preez, C.C.

Snyman, H.A. and du Preez, C.C.