@article {yang2017pyramid,
	title = {Pyramid sketch: A sketch framework for frequency estimation of data streams},
	journal = {Proceedings of the VLDB Endowment},
	volume = {10},
	number = {11},
	year = {2017},
	pages = {1442{\textendash}1453},
	author = {Tong Yang and Yang Zhou and Hao Jin and Chen, Shigang and Xiaoming Li}
}
