| Authors Name |
|---|
| Anoniem [2] |
| Appel, A [1] |
| Booyse, N [1] |
| Dreyer, N [1] |
| Esterhuizen, S J [1] |
| Heystek, B [1] |
| Kapp, P H [2] |
| Oosthuizen, C [1] |
| Plug, C E [1] |
| Posthuma, A J [1] |
| Trümpelmann, M [1] |
| Trümpelmann, M H [1] |
| Van den Berg, H. [1] |
| Van Niekerk, J H [1] |
| Venter, C [1] |