Wolf H. Holzmann Hadi Kharaghani Behruz Tayfeh-Rezaie Williamson matrices up to order 59. 343-352 2008 46 Des. Codes Cryptography 3 http://dx.doi.org/10.1007/s10623-007-9163-5 db/journals/dcc/dcc46.html#HolzmannKT08