00384nam a2200169 a 450000500170000002000180001708200160003510000230005110000180007424500370009225000110012926000290014030000250016960000080019485600060020285600060020820251203112345.0 a9780817645281 a510.76bAND aAndreescu, Titud_ aGelca, Razvan aMathematical olympiad challenges a2nd ed aBostonbBirkhauserc2009 axii,283p.c24cm.bPB bc_ f_ a_