Aart Blokhuis Tamás Szonyi Zsuzsa Weiner On Sets without Tangents in Galois Planes of Even Order. 91-98 2003 29 Des. Codes Cryptography 1-3 http://dx.doi.org/10.1023/A:1024192106237 db/journals/dcc/dcc29.html#BlokhuisSW03