**Articles:**

- M du Sautoy, Sexy maths: ditch the GPS, just follow the colour code,
*The Times*(4 March 2009). - Israeli ex-security guard solves 38-year-old math problem,
*Haaretz Newspaper*(20 March 2008).

http://haaretz.com/hasen/spages/966679.html - A Heller, Security guard solves 38-year-old maths poser,
*The Guardian*(Friday 21 March 2008). - R Highfield, Directions from anywhere: maths problem solved,
*The Telegraph*(21 March 2008). - K Kloosterman, Israeli immigrant solves 38-year-old math problem,
*ISRAEL21c*(18 February 2008). - J Siegel-Itzkovich, Russian immigrant solves math puzzle,
*The Jerusalem Post*(8 February, 2008).

The URL of this page is:

http://www-history.mcs.st-andrews.ac.uk/References/Trahtman.html