Nicolas Bedon Alexis Bès Olivier Carton Chloe Rispal Logic and Rational Languages of Words Indexed by Linear Orderings. 76-85 2008 CSR http://dx.doi.org/10.1007/978-3-540-79709-8_11 conf/csr/2008 db/conf/csr/csr2008.html#BedonBCR08