A Kleene theorem for weighted tree automata

Authors: 
Droste, M.
Pech, C.
Vogler, H.
Year: 
2005
Appeared / Erschienen in: 
Theory of Computing Systems, 38 (2005), 1-38.
Abstract link: 
http://www.informatik.uni-leipzig.de/~droste/droabtcs.html#tcs39