@article{10_37236_959,
     author = {Peter Borg},
     title = {Intersecting systems of signed sets},
     journal = {The electronic journal of combinatorics},
     year = {2007},
     volume = {14},
     doi = {10.37236/959},
     zbl = {1122.05091},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/959/}
}