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Vrstica 44: == Zunanje povezave == * [http://astronomy.swin.edu.au/~pbourke/fun/4444 Bourke, Paul. ~~<i>~~''Four Fours Problem~~</i>~~''.] * [http://www.dwheeler.com/fourfours Wheeler, David A. 2002. ~~<i>~~''The Definitive Four Fours Answer Key~~</i>~~''.] * [http://www.johnvalentine.co.uk/p00010.html John Valentine's Four Fours page.] * [http://www-2.cs.cmu.edu/~chengwen/four4/four4.html Cheng-Wen's Four Fours page.] * [http://www.cut-the-knot.org/arithmetic/funny/4_4.shtml A. Bogomolny's Four Fours page] at [[cut-the-knot]] * [http://mathforum.org/ruth/four4s.puzzle.html Carver, Ruth. ~~<i>~~''Four Fours Puzzle~~</i>~~'' at MathForum.org] * [http://www.wheels.org/math/44s.html ~~<i>~~''Four Fours Problem~~</i>~~'' at Wheels.org] * [http://www.math.toronto.edu/mathnet/questionCorner/fourfours.html University of Toronto Math Net's <i>The Four Fours Problem<i>] * [http://drb9.drb.insel.de/~heiner/Puzzles/Year Marxen, Heiner. <i>The Year Puzzle<i>]

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