Geodesic
Difference sets and planar polarities
Glasgow mathematical journal, Tome 15 (1974) no. 2, pp. 99-108

Voir la notice de l'article provenant de la source Cambridge University Press

A block design is a finite set p of elements called points, where |p| = v, together with certain distinguished subsets of p called blocks, such that(i) each block contains k points,(ii) each point is contained in r blocks, and(iii) two distinct points are contained in precisely λ blocks. 
Ganley, Michael J. Difference sets and planar polarities. Glasgow mathematical journal, Tome 15 (1974) no. 2, pp. 99-108. doi: 10.1017/S0017089500002263
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