| A shrinking lemma for random forbidding context languages A van der Walt, S Ewert Theoretical Computer Science 237 (1-2), 149-158, 2000 | 40 | 2000 |
| A pumping lemma for random permitting context languages S Ewert, A van der Walt Theoretical Computer Science 270 (1-2), 959-967, 2002 | 38 | 2002 |
| Random context picture grammars S Ewert Stellenbosch: Stellenbosch University, 1999 | 32 | 1999 |
| Computing raster images from grid picture grammars F Drewes, S Ewert, R Klempien-Hinrichs, HJ Kreowski Journal of Automata, Languages and Combinatorics 8 (3), 499-519, 2003 | 23 | 2003 |
| Abstracting and narrating novice programs using regular expressions A Ade-Ibijola, S Ewert, I Sanders Proceedings of the Southern African Institute for Computer Scientist and …, 2014 | 21 | 2014 |
| Generating pictures using random permitting context S Ewert, A Van Der Walt International Journal of Pattern Recognition and Artificial Intelligence 13 …, 1999 | 21 | 1999 |
| Random context picture grammars: The state of the art S Ewert Manipulation of Graphs, Algebras and Pictures, 135-147, 2009 | 17 | 2009 |
| Generating pictures using random forbidding context S Ewert, A van der Walt International journal of pattern recognition and artificial intelligence 12 …, 1998 | 17 | 1998 |
| Regex Parser II: Teaching regular expression fundamentals via educational gaming A Rosenfeld, A Ade-Ibijola, S Ewert ICT Education: 46th Annual Conference of the Southern African Computer …, 2017 | 13 | 2017 |
| Introducing Code Adviser: A DFA-driven electronic programming tutor A Ade-Ibijola, S Ewert, I Sanders Implementation and Application of Automata: 20th International Conference …, 2015 | 10 | 2015 |
| Random context tree grammars and tree transducers: reviewed article F Drewes, C Du Toit, S Ewert, J Hogberg, B Van der Merwe, ... South African Computer Journal 2005 (34), 11-25, 2005 | 10 | 2005 |
| A property of random context picture grammars A van der Walt, S Ewert Theoretical computer science 301 (1-3), 313-320, 2003 | 10 | 2003 |
| A hierarchy result for random forbidding context picture grammars S Ewert, A Van Der Walt International journal of pattern recognition and artificial intelligence 13 …, 1999 | 10 | 1999 |
| A novel approach to visual password schemes using tree picture grammars B Okundaye, S Ewert, I Sanders Proceedings of the 2014 PRASA, RobMech and AfLaT International Joint …, 2014 | 9 | 2014 |
| A note on the generative capacity of random context: reviewed article B Atcheson, S Ewert, D Shell South African Computer Journal 2006 (36), 95-98, 2006 | 9 | 2006 |
| Bag context tree grammars F Drewes, C du Toit, S Ewert, B van der Merwe, APJ van der Walt Developments in Language Theory: 10th International Conference, DLT 2006 …, 2006 | 9 | 2006 |
| Shrink Indecomposable Fractals. S Ewert, APJ van der Walt J. Univers. Comput. Sci. 5 (9), 521-531, 1999 | 9 | 1999 |
| Requirements for secure graphical password schemes M Rasekgala, S Ewert, I Sanders, T Fogwill 2014 IST-Africa Conference Proceedings, 1-10, 2014 | 7 | 2014 |
| Determining image similarity from pattern matching of abstract syntax trees of tree picture grammars B Okundaye, S Ewert, I Sanders Proceedings of the Twenty-Fourth Annual Symposium of the Pattern Recognition …, 2013 | 7 | 2013 |
| Table-driven context-free picture grammars C Bhika, S Ewert, R Schwartz, M Waruhiu International Journal of Foundations of Computer Science 18 (06), 1151-1160, 2007 | 7 | 2007 |
Ian SandersUniversity of the Witwatersrand, JohannesburgAdresse e-mail validée de wits.ac.za
