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Billette de Villemeur, Etienne and Ruble, Richard and Versaevel, Bruno (2013): Investment Timing and Vertical Relationships. Published in: International Journal of Industrial Organization , Vol. 33, (March 2014): pp. 110-123.
Billette de Villemeur, Etienne and Ruble, Richard and Versaevel, Bruno (2014): Innovation and imitation incentives in dynamic duopoly.