From time to time, cryptic references have appeared in the literature of logology to isograms, words or terms consisting of letters each one of which appears "n" times. There has, however, been no general review of the subject since my initial essay on it in Language on Vacation (Scribner's, 1965). The purpose of this article is to update the subject, displaying the present state of research regarding it.
Borgmann, Dmitri A.
"An Overview of Isograms,"
Word Ways: Vol. 7
, Article 10.
Available at: http://digitalcommons.butler.edu/wordways/vol7/iss1/10