Richard Ruble (EMLYON & CNRS, GATE),
Bruno Versaevel (EMLYON & CNRS, GATE) and
Étienne de Villemeur (Toulouse School of Economics (IDEI & GREMAQ)),
"On the Timing of Vertical Relationships",
IDEI Working Paper, n. 627, June 23, 2010, revised April 11, 2011.