@article{10_37236_1316,
     author = {N. Alon and D. J. Kleitman},
     title = {A purely combinatorial proof of the {Hadwiger} {Debrunner} \((p,q)\) conjecture},
     journal = {The electronic journal of combinatorics},
     year = {1997},
     volume = {4},
     number = {2},
     doi = {10.37236/1316},
     zbl = {0889.52008},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1316/}
}