-\author{Jean-Fran\c cois Couchot, Raphael Couturier, and Christophe Guyeux*\\
- $*:$ Authors in alphabetic order.\\
- FEMTO-ST Institute, UMR 6174 CNRS\\
- Computer Science Laboratory DISC,
- University of Franche-Comt\'{e},
- Besan\c con, France.
-}
-%\authorrunning{J.-F. Couchot, R. Couturier, and C. Guyeux}