1. Baker, B. Composition of top-down and bottom-up tree transducers, submitted for publication.
2. Baker, B. Generalized syntax directed translation, tree transducers, and linear space, SIAM J. on Computing, to appear.
3. Tree acceptors and some of their applications;Doner;J. Comput. and System Sci.,1970
4. Bottom-up and top-down tree transformations;Engelfriet;Math. Systems Theory,1975
5. Substitution in families of languages;Ginsburg;Info. Sci.,1970