1. Quasi-symmetric 3-designs and elliptic curves;Calderbank;SIAM J. Discrete Math.,1990
2. Near regularity conditions for designs;Cameron;Geom. Dedicata,1973
3. Finite Geometries;Dembowski,1968
4. Regularity in tournaments;Herzog,1978
5. Projective geometries over finite fields;Hirschfeld,1983