@Inproceedings{EPTCS126.4,
  author    = {Grathwohl, Niels Bj{\o}rn Bugge  and Henglein, Fritz and Kozen, Dexter},
  year      = {2013},
  title     = {Infinitary Axiomatization of the Equational Theory of Context-Free Languages},
  editor    = {Baelde, David and Carayol, Arnaud},
  booktitle = {{\rm Proceedings Workshop on}
               Fixed Points in Computer Science,
               {\rm Turino, Italy, September 1st, 2013}},
  series    = {Electronic Proceedings in Theoretical Computer Science},
  volume    = {126},
  publisher = {Open Publishing Association},
  pages     = {44-55},
  doi       = {10.4204/EPTCS.126.4},
}