preprint-author: 
B. Bielefeld, Y. Fisher, AND J. Hubbard
preprint-title: 
The Classification of Critically Preperiodic Polynomials as Dynamical Systems
preprint-abstract: 

The object of this paper is to classify all polynomials $p$ with the properties that all critical points of $p$ are strictly preperiodic under iteration of $p$. We will also characterize the Julia sets of such polynomials.

preprint-year: 
1991