@article{journals/iandc/Buttelmann75a,
	title = {On the Syntactic Structures of Unrestricted Grammars I. Generative Grammars and Phrase Structure Grammars},
	author = {H. William Buttelmann},
	journal = {Information and Control},
	month = {September},
	number = {1},
	pages = {29-80},
	url = {http://theory.lcs.mit.edu/~iandc/ic75.html},
	volume = {29},
	year = {1975},
	biburl = {http://www.bibsonomy.org/bibtex/2268437bbd56c20ce2eceefa25269b24f/dblp},
	description = {dblp},
	date = {2003-11-20},
	keywords = {dblp }
}