hal-04255301 title_s Clark measures and a theorem of Ritt auteur Isabelle Chalendar, Pamela Gorkin, Jonathan Partington, William Ross journal Mathematica Scandinavica volume 122 numero 2 pages 277-298 doi 10.7146/math.scand.a-104444 fichier_autre http://eprints.whiterose.ac.uk/116652/1/Clark_Measure_version_6.pdf origine_autre openaccess annee 2018