1. Note on (q + 2)-sets in a Galois plane of order q;Bichara,1982
2. Blocking sets in Desarguesian projective planes;Blokhuis;Bull. London Math. Soc.,1986
3. Blocking sets in finite projective planes;Bruen;Siam J. Appl. Math.,1971
4. Blocking sets. invited address;Cameron,1984
5. On thick (q + 2)-sets;Capodaglio di Cocco,1986