00410nam a2200145 a 450000500170000002000150001708200150003210000200004724500240006726000480009130000270013949000530016670000260021970000190024520251203110154.0  a0521444322  a511.6bBET  aBeth, Thomasd_  aDesign theory;vol.I  aCambridgebCambridge University Pressc1999  axix,1100p.c23 cm H.B.  aEncyclopedia of mathematics and its applications  aJungnickel,Dieter and  aLenz, Hanfried