PProblems to ponderProblems to ponderde Derek HoltonEdiciones (1)Problems to ponder. (1998)Mathematical Association · inglésMás obras de Derek HoltonSSecond Step to Mathematical Olympiad ProblemsSecond Step to Mathematical Olympiad ProblemsCCreative Activities in Mathematics Bk. 3Creative Activities in Mathematics Bk. 3CCreative Activities in Mathematics Bk. 2Creative Activities in Mathematics Bk. 2