@book{ Solr-11075239, title = {Theory Is Forever : Essays Dedicated to Arto Salomaa on the Occasion of His 70th Birthday}, series = {Lecture notes in computer science ;}, author = {Karhumäki, Juhani, 1949-}, editor = {Maurer, Hermann A., 1941-}, editor = {Păun, Gheorghe}, editor = {Rozenberg, Grzegorz}, address = {Berlin, Heidelberg}, publisher = {Springer Berlin Heidelberg}, year = {2004}, url = {http://link.springer.com/10.1007/b98751} }