Изменения

*''Jean-Claude Junqua,Gertjan van Noord'' — Robustness in Language and Speech Technology — Kluwer Academic Publishers, 2001 — ISBN 0-7923-6790-1

* [https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCkQFjAA&url=http%3A%2F%2Fwww.cs.ucsb.edu%2F~omer%2FDOWNLOADABLE%2Fcfg-reg09.pdf&ei=AQbcUrL_DIfi4wSx3IDYDg&usg=AFQjCNHsSWONr0_c2MDgvApwrhc81deY0w&sig2=_2iZj4Xexe6-p5Cyt-GEMg&bvm=bv.59568121,d.bGE Strongly Regular Grammars and Regular Approximation of Contex-Free Languages]

*''Willem J. M. Levelt'' — An Introduction to the Theory of Formal Languages and Automata — John Benjamin B.V., 2008 — ISBN 978-90-272-3250-2