Unavailability and the Evaluation of Goods
Theo M M Verhallen, Henry S J Robben
Kyklos, vol. 48, 1995, p. 369-387.

Behavioral Costs as Determinants of Cost Perception and Preference Formation for Gifts to Receive and Gifts to Give
Henry S J Robben, Theo M M Verhallen
Journal Of Economic Psychology, vol. 15, 1994, p. 333-350.

Scarcity and Preference: An Experiment on Unavailability and Product Evaluation
Theo M M Verhallen, Henry S J Robben
Journal Of Economic Psychology, vol. 15, 1994, p. 315-331.