@article{10_37236_1830,
     author = {Paul R. Hafner},
     title = {On the graphs of {Hoffman-Singleton} and {Higman-Sims}},
     journal = {The electronic journal of combinatorics},
     year = {2004},
     volume = {11},
     number = {1},
     doi = {10.37236/1830},
     zbl = {1060.05073},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1830/}
}