Helmut Alt, Michel Habib. STACS 2003: 20th Annual Symposium on Theoretical Aspects of Computer Science Berlin, Germany, February 27 – March 1, 2003 Proceedings. France. Lecture Notes in Computer Science (2607), 2003, 978-3-540-00623-7 (Print) 978-3-540-36494-8 (Online).
〈10.1007/3-540-36494-3〉.
〈lirmm-00269587〉 
