THAT PROPOSES MATHEMATICS PROBLEMS
Problems and Solutions SIAM.
Math Magic, Florida, USA.
Monthly problem of Regina university.
Math Problem of the Month - Bilkent University, Ankara, Turchia.
La rivista "Mathematical Excalibur" - Hong Kong University, Cina.
La Gaceta de la Real Sociedad Matematica Espanola, Spagna.
Ponder This - IBM Research.
Problema del mese - Dipartimento di Matematica, Milano.
La rivista "K�mal", Budapest, Ungheria.
Problem of the Month, Stony Brook NY, USA.
Pi Mu Epsilon Journal.