@article {16362,
	title = {Skip lists: a probabilistic alternative to balanced trees},
	journal = {Communications of the ACMCommun. ACM},
	volume = {33},
	year = {1990},
	month = {1990/06//},
	pages = {668 - 676},
	isbn = {00010782},
	doi = {10.1145/78973.78977},
	url = {http://dl.acm.org/citation.cfm?id=78977,},
	author = {Pugh, William}
}
