@article {2864,
	title = {Elastic Properties of C and BxCyNz Composite Nanotubes},
	journal = {Physical Review Letters},
	volume = {80},
	year = {1998},
	pages = {4502},
	author = {Hernandez, Eduardo R. and Goze, Christophe and Bernier, Patrick and Rubio, Angel}
}
