@book{120114,
	author = {Kriegel, Hans-Peter, and Gesellschaft für Informatik. and GI Symposium on Theoretical Computer Science},
	title = {Theoretical computer science :},
	publisher = {Springer,},
	year = {1982},
	address = {Berlin :},
	note = {Paper presented at the 6th Biannual GI Symposium on Theoretical Computer Science, held in Dortmund, Germany, Jan. 5-7, 1983, and sponsored by the Special Interest Group for Automata and Formal Language Theory of the Gesellschaft für Informatik}
}