Geodesic
On relative difference sets and projective planes
Glasgow mathematical journal, Tome 15 (1974) no. 2, pp. 150-154

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

A permutation group is quasiregular if it acts regularly on each of its orbits (i.e. the stabiliser of an element fixes every other element in its orbit). So, in particular, any permutation representation of an abelian or hamiltonian group must be quasiregular. 
Piper, Fred. On relative difference sets and projective planes. Glasgow mathematical journal, Tome 15 (1974) no. 2, pp. 150-154. doi: 10.1017/S0017089500002329
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