Formal Grammar: 17th and 18th International Conferences, FG 2012 Opole, Poland, August 2012, Revised Selected PapersFG 2013 Düsseldorf, Germany, August 2013, Proceedings

Formal Grammar: 19th International Conference, Formal Grammar 2014, Tübingen, Germany, August 16-17, 2014. Proceedings

Formal Grammar: 20th and 21st International Conferences, FG 2015, Barcelona, Spain, August 2015, Revised Selected Papers. FG 2016, Bozen, Italy, August 2016, Proceedings