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@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/} }
W.L. Edge. Some implications of the geometry of the 21-point plane.. Mathematische Zeitschrift, Tome 87 (1965), pp. 348-362. http://geodesic.mathdoc.fr/item/MZ_1965__87_170385/