1. Designs and Their Codes;Assmus,1992
2. Irreducible blocking sets in a symmetric design;Berardi;Boll. Un. Mat. Ital.,1987
3. Algebra e teoria dei codici correttori;Berardi,1994
4. Blocking sets of the known biplanes;Berardi;Rend. di Mat. Univ. Roma,1987
5. Costructing the biplanes of order four from six points;Berardi;Boll. Un. Mat. Ital. A,1988