@ARTICLE{Zetzsche2011a,
	AUTHOR		= {Zetzsche, Georg},
	TITLE		= {Toward Understanding the Generative Capacity of Erasing Rules in Matrix Grammars},
	JOURNAL		= {International Journal of Foundations of Computer Science},
	VOLUME		= {22},
	NUMBER		= {2},
	PAGES		= {411--426},
	YEAR		= {2011},
	DOI		= {10.1142/S0129054111008118}
}