References for Abram Naumovich Trakhtman
- 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).
- 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).
MacTutor History of Mathematics