Anton Betten Adalbert Kerber Axel Kohnert Reinhard Laue Alfred Wassermann The Discovery of Simple 7-Designs with Automorphism Group PTL (2, 32). 131-145 1995 conf/aaecc/1995 AAECC db/conf/aaecc/aaecc1995.html#BettenKKLW95 http://dx.doi.org/10.1007/3-540-60114-7_10