Deterministic Context-Free Languages are Closed Under Complementation (Hopcroft and Ullman) by Kaan Taskin and Tobias Nipkow Aug 24
Context-Free Grammars and Languages by Tobias Nipkow, Markus Gschoßmann, Felix Krayer, Fabian Lehr, Bruno Philipp, August Martin Stimpfle, Kaan Taskin and Akihisa Yamada May 21