@article {,
	title = {Theory is Forever},
	journal = {Lecture Notes in Computer Science},
	volume = {3113},
	year = {2004},
	note = {Gheorghe Paun; Grzegorz Rozenberg; Hermann Maurer; Juhani Karhumaki (eds.)},
	pages = {X+283},
	publisher = {Springer-Verlag},
	address = {Berl{\'\i}n, Alemania},
	isbn = {3-540-22393-2},
	url = {http://www.sigmod.org/dblp/db/conf/birthday/salomaa2004.html},
	author = {Gheorghe Paun and Grzegorz Rozenberg and Hermann Maurer and Juhani Karhumaki}
}
