@article{10.1145/322248.322255,
    Address = {New York, NY, USA},
    Author = {Karr, Michael},
    ISSN = {0004-5411},
    Journal = {J. ACM},
    Month = {April},
    Number = {2},
    Pages = {305--350},
    Publisher = {Association for Computing Machinery},
    Title = {Summation in Finite Terms},
    URL = {https://doi.org/10.1145/322248.322255},
    Volume = {28},
    Year = {1981},
    bdsk-url-1 = {https://doi.org/10.1145/322248.322255},
    date-added = {2021-04-02 11:00:22 +0200},
    date-modified = {2021-04-02 11:00:22 +0200},
    issue_date = {April 1981},
    numpages = {46},
    doi = {10.1145/322248.322255}
}

@article{10.1145/322248.322255, Address = {New York, NY, USA}, Author = {Karr, Michael}, ISSN = {0004-5411}, Journal = {J. ACM}, Month = {April}, Number = {2}, Pages = {305--350}, Publisher = {Association for Computing Machinery}, Title = {Summation in Finite Terms}, URL = {https://doi.org/10.1145/322248.322255}, Volume = {28}, Year = {1981}, bdsk-url-1 = {https://doi.org/10.1145/322248.322255}, date-added = {2021-04-02 11:00:22 +0200}, date-modified = {2021-04-02 11:00:22 +0200}, issue_date = {April 1981}, numpages = {46}, doi = {10.1145/322248.322255} }