@article{2008-sica, author = "Martin Schaller and Karl Svozil", title = "Scale-invariant cellular automata and self-similar Petri nets", DOI= "10.1140/epjb/e2009-00147-x", url= "http://dx.doi.org/10.1140/epjb/e2009-00147-x", journal = "The European Physical Journal B", year = 2009, volume = "69", pages="297–311" }