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GRA20 Problem Solving Group |
Mathematics Magazine, USA.
College Mathematics Journal, USA.
Mathematical Excalibur - Hong Kong University, Cina.
Ponder This - IBM Research, USA.
Mathematical Reflections, USA.
Pi Mu Epsilon Journal, USA.
The Harvard College Mathematics Review, USA.
Northwestern University Math Problem Solving Group, USA.
Missouri Journal of Mathematical Sciences, USA.
La Gaceta de la Real Sociedad Matematica Espanola, Spagna.
Revista Escolar de Matemáticas, Spagna.
Publications of the Faculty of Electrical Engineering, Yugoslavia.
The prime puzzles & problems connections.
Math Problem of the Month - Bilkent University, Turchia.
Giornalino di Matematica - Progetto Olimpiadi, Pisa.
Problema del mese - Dipartimento di Matematica, Milano.
La rivista "Kömal", Ungheria.
The On-Line Encyclopedia of Integer Sequences.
The Inverse Symbolic Calculator.
MathPro Press.
Al Zimmermann's Programming Contests.
MathWorld.
Cut the knot.
José Luís Fachada's Problem Page.