@article {2459,
	title = {Stability and Electronic Properties of Two-Dimensional Silicene and Germanene on Graphene },
	journal = {Physical Review B },
	volume = {88},
	year = {2013},
	pages = {245408},
	author = {Y. Cai and Chuu, C. P. and Wei, C. M. and Chou, M. Y.}
}
