Non-uniform cellular automata and distributions of rules
  In this paper we study $\nu$-CA on one-dimensional lattice defined over a finite set of local rules. The main goal is to determine how the local rules can be mixed to ensure the produced $\nu$-CA has some properties. In a first part, we give some background for the study of $\nu$-CA. Then surjectivity and injectivity are studied using a variant of DeBruijn graphs. The next part is dedicated to the number-conserving property. 
Julien Provillard, Enrico Formenti, Alberto Dennunzio
cs.FL nlin.CG