@article {10697,
	title = {Universal field-emission model for carbon nanotubes on a metal tip},
	journal = {Applied Physics Letters},
	year = {2002},
	pages = {506-508},
	doi = {10.1063/1.1430507},
	author = {D.Y. Zhong and G.Y. Zhang and S. Liu and T. Sakurai and E.G. Wang}
}
