00442nam a2200145 a 450000500170000002000150001708200150003210000230004724500650007026000480013530000240018349000520020770000180025970000190027720251203110607.0  a0523531438  a511.5bDAV  aDavidoff, Giuliana  aElementary Number Theory, Group Theory, and Ramanujan Graphs  aCambridgebCambridge University Pressc2003  aix,144p.c24 cm. PB  aLondon Mathematical Society Student Textsdv.55  aSarnak, Peter  aValette, Alain