@article{10_1090_S0894_0347_2012_00759_0,
     author = {Pach, J\~A{\textexclamdown}nos and Tardos, G\~A{\textexclamdown}bor},
     title = {Tight lower bounds for the size of epsilon-nets},
     journal = {Journal of the American Mathematical Society},
     pages = {645--658},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {2013},
     doi = {10.1090/S0894-0347-2012-00759-0},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-2012-00759-0/}
}