@article {5076,
	title = {Ultrafast relaxation of excited dirac fermions in epitaxial graphene using optical differential transmission spectroscopy},
	journal = {Physical Review Letters},
	year = {2008},
	doi = {10.1103/PhysRevLett.101.157402},
	author = {Dong Sun and Zong-Kwei Wu and Charles Divin and Xuebin Li and Claire Berger and Walt A. De Heer and Phillip N. First and Theodore B. Norris}
}
