K. G. Subramanian, Rosihan M. Ali, M. Geethalakshmi, Atulya K. Nagar. Pure 2D picture grammars and languages. Discrete Applied Mathematics, 157(16):3401-3411, 2009. [doi]
@article{SubramanianAGN09,
title = {Pure 2D picture grammars and languages},
author = {K. G. Subramanian and Rosihan M. Ali and M. Geethalakshmi and Atulya K. Nagar},
year = {2009},
doi = {10.1016/j.dam.2009.02.017},
url = {http://dx.doi.org/10.1016/j.dam.2009.02.017},
tags = {grammar},
researchr = {https://researchr.org/publication/SubramanianAGN09},
cites = {0},
citedby = {0},
journal = {Discrete Applied Mathematics},
volume = {157},
number = {16},
pages = {3401-3411},
}