Generating Pictures Using Random Forbidding Context. - Sigrid Ewert; Andries P. J. van der Walt (Int. J. Pattern Recognit. Artif. Intell., 1998)

A Hierarchy Result for Random Forbidding Context Picture Grammars. - Sigrid Ewert; Andries P. J. van der Walt (Int. J. Pattern Recognit. Artif. Intell., 1999)

Generating Pictures Using Random Permitting Context. - Sigrid Ewert; Andries P. J. van der Walt (Int. J. Pattern Recognit. Artif. Intell., 1999)

Shrink Indecomposable Fractals. - Sigrid Ewert; Andries P. J. van der Walt (J. Univers. Comput. Sci., 1999)

A shrinking lemma for random forbidding context languages. - Andries P. J. van der Walt; Sigrid Ewert (Theor. Comput. Sci., 2000)

Processing context-sensing picture grammars on a network. - Sigrid Ewert; T. Wessels (South Afr. Comput. J., 2001)

A pumping lemma for random permitting context languages. - Sigrid Ewert; Andries P. J. van der Walt (Theor. Comput. Sci., 2002)

The Power and Limitations of Random Context. - Sigrid Ewert; Andries P. J. van der Walt (Grammars and Automata for String Processing, 2003)

Computing Raster Images from Grid Picture Grammars. - Frank Drewes; Sigrid Ewert; Renate Klempien-Hinrichs; Hans-Jörg Kreowski (J. Autom. Lang. Comb., 2003)

A property of random context picture grammars. - Andries P. J. van der Walt; Sigrid Ewert (Theor. Comput. Sci., 2003)

GRIFFIN : an automated grcpg and IFS processing tool. - Nicole Boden; Bradley Atcheson; Sigrid Ewert (South Afr. Comput. J., 2004)

Random context tree grammars and tree transducers. - Frank Drewes; Christine du Toit; Sigrid Ewert; Johanna Högberg; Brink van der Merwe; Andries P. J. van der Walt (South Afr. Comput. J., 2005)

A note on the generative capacity of random context. - Bradley Atcheson; Sigrid Ewert; Dylan A. Shell (South Afr. Comput. J., 2006)

Translating mutually recursive function systems into generalized random context picture grammars. - H. Kruger; Sigrid Ewert (South Afr. Comput. J., 2006)

Table-Driven Context-Free Picture Grammars. - Charita Bhika; Sigrid Ewert; Ryan Schwartz; Mutahi Waruhiu (Int. J. Found. Comput. Sci., 2007)

Bag Context Tree Grammars. - Frank Drewes; Christine du Toit; Sigrid Ewert; Brink van der Merwe; Andries P. J. van der Walt (Fundam. Informaticae, 2008)

Generalized Random Context Picture Grammars: The State of the Art. - Sigrid Ewert; Max Rabkin (Languages Alive, 2012)

Empirical measurements on a Sesotho tone labeling algorithm. - Mpho Raborife; Sabine Zerbian; Sigrid Ewert (SLTU, 2012)

Necessary conditions for subclasses of random context languages. - Sigrid Ewert; Andries P. J. van der Walt (Theor. Comput. Sci., 2013)

Abstracting and Narrating Novice Programs Using Regular Expressions. - Abejide Ade-Ibijola; Sigrid Ewert; Ian D. Sanders (SAICSIT, 2014)

Perceptual Similarity of Images Generated using Tree Grammars. - Benjamin Okundaye; Sigrid Ewert; Ian D. Sanders (SAICSIT, 2014)

Introducing Code Adviser: A DFA-driven Electronic Programming Tutor. - Abejide Ade-Ibijola; Sigrid Ewert; Ian Douglas Sanders (CIAA, 2015)

Improving a tone labeling algorithm for Sesotho. - Mpho Raborife; Sigrid Ewert; Sabine Zerbian (Lang. Resour. Evaluation, 2015)

Describing Resource Allocation to Dynamically Formed Groups with Grammars. - Suna Bensch; Sigrid Ewert (SIMULTECH (Selected Papers), 2017)

Modelling the Formation of Virtual Buying Cooperatives with Grammars of Regulated Rewriting. - Suna Bensch; Sigrid Ewert; Mpho Raborife (SIMULTECH, 2017)

Measuring Perceptual Similarity of Syntactically Generated Pictures. - Nuru Jingili; Sigrid Ewert; Ian D. Sanders (SIMULTECH, 2018)

Bag context picture grammars. - Sigrid Ewert; Nuru Jingili; Liemiso Mpota; Ian D. Sanders (J. Comput. Lang., 2019)

Necessary Conditions for Subclasses of Random Context Galleries. - Sigrid Ewert; Daria Sergeevna Tkachova (J. Autom. Lang. Comb., 2020)

Ogden's Lemma for Subclasses of Random Context Galleries. - Sigrid Ewert; Joy Idahosa (J. Autom. Lang. Comb., 2021)