R. Banker, Estimating most productive scale size using data envelopment analysis, European J. Oper Res, vol.17, pp.35-44, 1984.

J. W. Baumol, J. C. Panzar, and R. D. Willig, Contestable markets and the theory of industry structure, 1982.

P. Bogetoft and D. Wang, Estimating the potential gains from mergers, J Prod Anal, vol.23, pp.145-171, 2005.

R. G. Chambers, C. Y. Färe, and R. , Benefit and distance function, J Econ Theory, vol.70, pp.407-419, 1996.

J. P. Chavas and M. Aliber, An analysis of economic efficiency in agriculture: a nonparametric approach, J Agr Resource Econ, vol.18, issue.1, pp.1-16, 1993.

D. Deprins, L. Simar, and H. Tulkens, The performance of public enterprises concepts and measurements, 1984.

R. Färe, Addition and efficiency, Quart J Econ, vol.101, pp.861-866, 1986.

M. J. Farrell, The convexity assumption in the theory of competitive markets, J Polit Economy, vol.67, issue.4, pp.377-391, 1959.

J. Fernandez-cornejo, I. I. Gempesaw, . Cm, J. G. Elterich, and S. E. Stefanou, Dynamic measures of scope and scale economies: an application to German agriculture, Amer J Agr Econ, vol.74, pp.329-342, 1992.

R. H. Green and W. D. Cook, A free coordination hull approach to efficiency measurement, J Opl Res Soc, vol.55, pp.1059-1063, 2004.

S. Grosskopf and S. Yaisawarng, Economies of scope in the provision of local public service, Nat Tax J, vol.43, issue.1, pp.61-74, 1990.

K. Kim, B. Barham, J. P. Chavas, and J. Foltz, Research and development at U.S. research universities: an analysis of scope economies. Staff Paper n°487, vol.43, 2005.

A. Maindiratta, Largest size-efficient scale and size efficiencies of decision-making units in Data Envelopment Analysis, J Econometrics, vol.46, pp.57-72, 1990.

J. C. Panzar and R. D. Willig, Economies of scope, Amer Econ Rev, vol.71, pp.268-272, 1981.

S. Wu and T. Prato, Cost efficiency and scope economies of crop and livestock farms in Missouri, J Agr Appl Econ, vol.38, issue.3, pp.539-553, 2006.