@InProceedings{baryossef2002,
    author="Bar-Yossef, Ziv
    and Jayram, T. S.
    and Kumar, Ravi
    and Sivakumar, D.
    and Trevisan, Luca",
    editor="Rolim, Jos{\'e} D. P.
    and Vadhan, Salil",
    title="Counting Distinct Elements in a Data Stream",
    booktitle="Randomization and Approximation Techniques in Computer Science",
    year="2002",
    publisher="Springer Berlin Heidelberg",
    _address="Berlin, Heidelberg",
    pages="1--10",
}

@article{alon1999,
    title = {The Space Complexity of Approximating the Frequency Moments},
    journal = {Journal of Computer and System Sciences},
    volume = {58},
    number = {1},
    pages = {137-147},
    year = {1999},
    issn = {0022-0000},
    _doi = {https://doi.org/10.1006/jcss.1997.1545},
    _url = {https://www.sciencedirect.com/science/article/pii/S0022000097915452},
    author = {Noga Alon and Yossi Matias and Mario Szegedy},
}
