5Dobson, Paul, Waterson M. , Vertical Restraints And Competition Policy. Office of Fair Trading Working Paper, No. 12, 1996.
6Englebrecht, H. , Are Purchased Information Services Underused In Manufacturing? Evidences from Japan, Korea and Taiwan. Applied Economics, Vol. 22, No. 2, 1990, pp. 201--209.
7Ferris, J. Stephen, Alternative Approaches to Vertical Restraints: Theoretical Models and Current Practices. Submitted to the Competition Bureau, 2001, p. 15.
