References
- Panzar , J.C. , Baumol , W. and Willig , R. 1982 . Contestable Markets and the Theory of Industrial Structure.
- Averch , H. and Johnson , L. 1962 . Behaviour of the firm under regulatory constraints. . American Economic Review. ,
- Vickers , J. and Yarrow , G. 1988 . Privatization and Economic Analysis. , MIT Press .