The ticket (single: 1.60 euros in January 2011) must be
stamped and is valid for one hour, no return (TCL).
It is available through automaton (which accepts coins and
gives change) just before the subway platform.
Warning:
once arrived at the Debourg station, you must reach the
"Campus Jacques Monod" (Science).
Not to be confused with the "Campus Rene Descartes"
(Letters).
Indications with pictures below.
another map of the quarte:
click here (unidentified
source)
Once at the Debourg station: (click on the pictures to enlarge)