A very introductory paper on
cryptography [pdf]
(covers substitution ciphers, the Vigenere cipher, one-time pads, the Hill
cipher), developed as a professional development workshop given to middle
school teachers as part of the
MSTP project I was involved in.
An Introduction to Fatou and Julia Sets
appears in Fractals, Wavelets, and their Applications,
edited by C. Bandt, M. Barnsely, R. Devaney, K.J. Falconer, V Kannan, V. Kumar.
pp. 37-60.
Finding Roots of Complex Polynomials with Newton's Method.
Thesis, Boston University (1989).
(This includes a brief addendum from Sept '89;
electronic versions of some of the figures have been lost, and have been
replaced by scans from a printout from 1990. Pagination differs slightly
from the original. )