The Analytic Representation of Substitutions on a Power of a Prime Number of Letters with a Discussion of the Linear Group.
Leonard Eugene Dickson · Annals of Mathematics · 1896
Leonard Eugene Dickson, The Analytic Representation of Substitutions on a Power of a Prime Number of Letters with a Discussion of the Linear Group., Annals of Mathematics, Vol. 11, No. 1/6 (1896 - 1897), pp. 65-120