Challenging mathematical problems with elementary solutions / A. M. Yaglom and I.
M. Yaglom ; transl. by James McCawley, rev. and ed. by Basil Gordon, 1987
Internet : http://www.ams.org/news?news_id=1396 (2020-04-10)
http://en.wikipedia.org/wiki/Basil_Gordon, 2012-04-07
Information trouvée : Basil Gordon (December 23, 1931 – January 12, 2012)