00276nam a2200133Ia 4500020000900000082000800009100002000017245007000037250000600107260000900113300000800122500000600130650000600136  aNULL  a510  aCofman, Judita  0aWhat To Solve ? Problems and Suggestions for Young Mathematicians  a-  a-b-  a250  a0  a-