Logics and graphs/automata/sequences

• The obstructions of a minor-closed set of graphs defined by a context-free grammar.
  Joint work with B. Courcelle.
  (Discrete Maths 1998).
  
• Iterated pushdown automata and sequences of rational numbers.
  Joint work with S. Fratani.
  (APAL 2006 - Special issue dedicated to the " 2nd Logic Days at St Petersburg ")
• Sequences of level 1, 2, 3,..., k,...
  LNCS 4649 - Proceedings of CSR 2007
  Marin's Master thesis, 2007 (quoted in above paper)
  talk (.pdf) given at CSR 2007.
• Words and trees
  Talk given at the Workshop in Honour of Hubert Comon-Lundh, 18-19 November 2008, Cachan
  
• Word-mappings of level 2.
  Joint work with J. Ferté and N. Marin.
  (Submitted to TOCS in Februray 2012)