1. Lecture Notes in Computer Science;S Almagor,2011
2. Berstel, J.: Transductions and Context-Free Languages. Leitfäden der Angewandten Mathematik und Mechanik [Guides to Applied Mathematics and Mechanics], vol. 38. B.G. Teubner, Stuttgart (1979)
3. Lecture Notes in Computer Science;J Berstel,1986
4. Bilkowski, M., Skrzypczak, M.: Unambiguity and uniformization problems on infinite trees. In: CSL, volume of LIPIcs, pp. 81–100 (2013)
5. Lecture Notes in Computer Science;M Bojańczyk,2012