@article{10_37236_1839,
     author = {Charles E. Killian and Frank Ruskey and Carla D. Savage and Mark Weston},
     title = {Half-simple symmetric {Venn} diagrams},
     journal = {The electronic journal of combinatorics},
     year = {2004},
     volume = {11},
     number = {1},
     doi = {10.37236/1839},
     zbl = {1060.05002},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1839/}
}