Locally constrained graph homomorphisms and equitable partitions.

Jirí Fiala Daniël Paulusma Jan Arne Telle Locally constrained graph homomorphisms and equitable partitions. 850-880 2008 29 Eur. J. Comb. 4 http://dx.doi.org/10.1016/j.ejc.2007.11.006 db/journals/ejc/ejc29.html#FialaPT08