@article {832, title = {Preface}, journal = {Fundamenta Informaticae}, volume = {110}, year = {2011}, pages = {1}, publisher = {IOS Press}, address = {Warsaw, Poland}, issn = {0169-2968}, url = {http://fi.mimuw.edu.pl/index.php/FI}, author = {Juhani Karhumaki and Gheorghe Paun and Grzegorz Rozenberg and Arto Salomaa} }