00297 a2200121 4500020001500000082001600015100001900031245003700050260003500087300001900122650001600141700001800157 a0817641556 a510.76bAND aAndreesu, Titu aMathematical olympiad challenges aBostonbBirkhauserc2000g2004 axv,260p.c24cm aMathematics aGelca, Razvan