@article {31622,
	title = {An ab initio study of a model of single wall GaN nanotubes with oxygen and zinc as impurities: structural and electronic properties},
	journal = {Acta Physica polonica A},
	volume = {113},
	year = {2008},
	pages = {713},
	author = {K. Rezouali and M. A. Belkhir}
}
