@article{10_4007_annals_2019_190_2_6,
     author = {Yaroslav Shitov},
     title = {Counterexamples to {Hedetniemi{\textquoteright}s} conjecture},
     journal = {Annals of mathematics},
     pages = {663--667},
     publisher = {mathdoc},
     volume = {190},
     number = {2},
     year = {2019},
     doi = {10.4007/annals.2019.190.2.6},
     mrnumber = {3997132},
     zbl = {07107185},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2019.190.2.6/}
}