The Sierpinski Triangle and The Ulam-Warburton Automaton
  This paper is about the beauty of fractals and the surprising connections between them. We will explain the pioneering role that the Sierpinski triangle plays in the Ulam-Warburton automata and show you a number of pictures along the way. 
Tanya Khovanova, Eric Nie, and Alok Puranik
math.HO math.CO