00378nam a2200145 a 450000500170000002000160001708200160003310000230004924500360007225000120010826000300012030000270015049000330017770000220021020251203110931.0  a97881286345  a510.76bSOU  aDesouza, Paulo Ney  aBerkley problems in mathematics  a3rd ed.  aNew DelhibSpringerc2004  axiv, 591p.c24 cm.bPB  aProblem books in mathematics  aSilva, Jorge-Nuno