@article{10_37236_3047,
     author = {Huajun Zhang},
     title = {Cross-intersecting families of labeled sets},
     journal = {The electronic journal of combinatorics},
     year = {2013},
     volume = {20},
     number = {1},
     doi = {10.37236/3047},
     zbl = {1267.05283},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/3047/}
}