@article{MZ_1973__135_172016,
     author = {Richard M. Wilson},
     title = {Nonisomorphic {Steiner} {Triple} {System.}},
     journal = {Mathematische Zeitschrift},
     pages = {303--314},
     publisher = {mathdoc},
     volume = {135},
     year = {1973},
     zbl = {0264.05009},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__135_172016/}
}