@proceedings{FreHolTruUUN_j2012, editor = {Rudolf Freund and Markus Holzer and Bianca~Truthe and Ulrich Ultes-Nitsche}, title = {{Fourth Workshop on Non-Classical Models of Automata and Applications (NCMA), Fribourg, Switzerland, August 23--24, 2012, Proceedings}}, year = {2012}, publisher = {{\"O}sterreichische Computer Gesellschaft, Austria}, series = {books@ocg.at}, volume = {290} }