@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},
description = {dblp},
date = {2003-11-20},
keywords = {dblp }
}
::