Classes of Tree Homomorphisms with Decidable Preservation of Regularity.

Guillem Godoy Sebastian Maneth Sophie Tison Classes of Tree Homomorphisms with Decidable Preservation of Regularity. 127-141 2008 FoSSaCS http://dx.doi.org/10.1007/978-3-540-78499-9_10 conf/fossacs/2008 db/conf/fossacs/fossacs2008.html#GodoyMT08