| 2008 |
| 3 | EE | Frank Drewes,
Christine du Toit,
Sigrid Ewert,
Brink van der Merwe,
Andries P. J. van der Walt:
Bag Context Tree Grammars.
Fundam. Inform. 86(4): 459-480 (2008) |
| 2006 |
| 2 | EE | Frank Drewes,
Christine du Toit,
Sigrid Ewert,
Brink van der Merwe,
Andries P. J. van der Walt:
Bag Context Tree Grammars.
Developments in Language Theory 2006: 226-237 |
| 2005 |
| 1 | | Frank Drewes,
Christine du Toit,
Sigrid Ewert,
Johanna Högberg,
Brink van der Merwe,
Andries P. J. van der Walt:
Random context tree grammars and tree transducers.
South African Computer Journal 34: 11-25 (2005) |