@inproceedings{Luc_SEEFM05,
  author    = "C. Luca",
  title     = "{Context-free grammar for a two-dimensional language}",
  booktitle = "2nd South-East European Workshop on Formal Methods (SEEFM 05), Formal Methods: Challenges in the Business World, Ohrid, 18-19 Nov 2005",
  month     = jun,
  editor    = "G. Eleftherakis",
  publisher = "South-East European Research Centre (SEERC)",
  year      = "2006",
  isbn      = "960-87869-8-3",
  pages     = "239--246"
};