@article{gk2012-journal,
	Author = {Giannakopoulos, Yiannis and Koutsoupias, Elias},
	Journal = {Theoretical Computer Science},
	Title = {Competitive Analysis of Maintaining Frequent Items of a Stream},
	Url = {http://dx.doi.org/10.1016/j.tcs.2014.09.011},
  	Doi = {10.1016/j.tcs.2014.09.011},
  	Volume = "562",
	Pages = "23--32",
	Year = "2015"
	}