Counting Fixed Points, Two-Cycles, and Collisions of the Discrete Exponential Function using p-adic Methods - Joshua Holden; Margaret M. Robinson (CoRR, 2011)

Counting fixed points and two-cycles of the singular map $x mapsto x^{x^n}$ modulo powers of a prime. - Joshua Holden; Pamela A. Richardson; Margaret M. Robinson (CoRR, 2016)