@article {5797,
	title = {Emergence of scaling in random networks},
	journal = {Science},
	volume = {286},
	year = {1999},
	note = {PDF},
	pages = {509-512},
	keywords = {evolution, network},
	author = {Barab{\'a}si, Albert-L{\'a}szl{\'o} and Albert, R{\'e}ka}
}
