By Doran Charles F.   Whitcher Ursula A.   in Mathematics Magazine

ISSN:1930-0980|85|5|343-360

Mathematical Association of America‎(2012)‎

Access to resources Favorite 14.441025

By Whitcher Ursula   in Communications in Algebra

ISSN:0092-7872|39|4|1427-1440

Taylor & Francis Ltd‎(2011)‎

Access to resources Favorite 4.6956487

By Whitcher Ursula   in The College Mathematics Journal

ISSN:1931-1346|42|1|56-56

Mathematical Association of America‎(2011)‎

Access to resources Favorite 4.6956487

By Smith Adam A.   Whitcher Ursula   in Math Horizons

ISSN:1947-6213|23|2|5-8

Mathematical Association of America‎(2015)‎

Access to resources Favorite 3.2869542