1. Tree transductions and families of tree languages;Baker,1973
2. Formal languages and recursion schemes;Downey,1974
3. Tree transducers and ETOL tree systems;Downey,1975
4. On some contextfree languages which are not EDTOL languages;Ehrenfeucht,1974
5. A relationship between ETOL and EDTOL languages;Ehrenfeucht,1974