@article{MZ_1965__87_170385,
     author = {W.L. Edge},
     title = {Some implications of the geometry of the 21-point plane.},
     journal = {Mathematische Zeitschrift},
     pages = {348--362},
     publisher = {mathdoc},
     volume = {87},
     year = {1965},
     zbl = {0136.15303},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__87_170385/}
}