@article {10446,
	title = {Large variation of vacancy formation energies in the surface of crystalline ice},
	journal = {Nature Materials},
	year = {2011},
	pages = {794-798},
	doi = {10.1038/nmat3096},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/21892176},
	author = {M. Watkins and D. Pan and E.G. Wang and A. Michaelides and J. Vandevondele and B. Slater}
}
