@article{Khanna_2000,
    doi = {10.1007/s004930070013},
    url = {https://doi.org/10.1007%2Fs004930070013},
    year = {2000},
    month = {mar},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {20},
    number = {3},
    pages = {393--415},
    author = {Sanjeev Khanna and Nathan Linial and Shmuel Safra},
    title = {On the Hardness of Approximating the Chromatic Number},
    journal = {Combinatorica}
}

@article{Khanna_2000, doi = {10.1007/s004930070013}, url = {https://doi.org/10.1007%2Fs004930070013}, year = {2000}, month = {mar}, publisher = {Springer Science and Business Media {LLC}}, volume = {20}, number = {3}, pages = {393--415}, author = {Sanjeev Khanna and Nathan Linial and Shmuel Safra}, title = {On the Hardness of Approximating the Chromatic Number}, journal = {Combinatorica} }