@article{DCG_1995__13_3-4_131360,
     author = {G. Kalai and N. Alon},
     title = {Bounding the {Piercing} {Number.}},
     journal = {Discrete & computational geometry},
     pages = {245--256},
     publisher = {mathdoc},
     volume = {13},
     number = {3-4},
     year = {1995},
     zbl = {0826.52006},
     url = {http://geodesic.mathdoc.fr/item/DCG_1995__13_3-4_131360/}
}