Sumit Ganguly. Counting distinct items over update streams. Theoretical Computer Science, 378(3):211-222, 2007. [doi]
@article{Ganguly07,
title = {Counting distinct items over update streams},
author = {Sumit Ganguly},
year = {2007},
doi = {10.1016/j.tcs.2007.02.031},
url = {http://dx.doi.org/10.1016/j.tcs.2007.02.031},
researchr = {https://researchr.org/publication/Ganguly07},
cites = {0},
citedby = {0},
journal = {Theoretical Computer Science},
volume = {378},
number = {3},
pages = {211-222},
}