19684 Hubert Comon a.o.: Tree automata techniques and applications.
Internet 2007, 260p.

19683 Johanna Högberg: Contributions to the theory and applications
of tree languages. Ph.D. thesis Univ. Umea 2007, 40p.

19311 Donald Knuth: The art of computer programming 4/4.
Generating all trees. History of combinatorial generation.
Addison-Wesley 2006, 120p. Eur 19.

19682 C. Perrault: Intercalation theorems for tree transducer languages.
Proc. 7th ACM Symp. Comp. 1975, 126-136.