Afonso, A.; Ayadi, M. & S. Ramzi (2013). assessing productivity performance of basic and secondary education in Tunisia: a Malmquist analysis. School of Economics and Management, Department of Economics, WORKING PAPERS.

Banker, R.D., Charnes. A. and W.W., Cooper (1984). Some models for estimating technical and scale inefficiencies in data envelopment analysis. Management Science, vol.30: 1078-1092
Bottasso, A., M., Conti (2009). Scale economies, technology and technical change: evidence from the English Water only sector. Regional Sci. Urban Econ, vol.39 (2): 138-147.
Brochado, M. R. (2016). Methodology to set the X-factor for price cap regulation in Toll roads: valuation for the case of Brazil. Phd thesis , Universidad Politecnica De Madrid.
Caves, D.W.; Christensen, L. R. & W. E. Diewert (1982). The Economic Theory of Index Numbers and Measurement of Input, Output and Productivity. Econometrica, vol.50: 1393-1414.
Charnes, A.; Cooper, W.W. & E. Rhodes (1978). Measuring Efficiency of Decision Making Units. European Journal of Operational Research, vol. 2: 429-44.
Coelli, T., D. S. P. Rao, G. E. Battase (1998). An Introduction to Efficiency and Productivity Analysis. Boston. Kluwer Academic Publishers.
Coelli, T., S., Walding (2006). Performance measurement in the Australian water supply industry: a preliminary analysis. In: Ceolli, T., Lawrence, D. (Eds.), Performance Measurement and Regulation of Network Utilities. Edward Elgar.
Ebrahimi Nourali, A.; Davoodabadi, M. & H. Pashazadeh (2014). Regulation and Efficiency & Productivity Considerations in Water & Wastewater Industry: Case of Iran. Procedia - Social and Behavioral Sciences, vol.109: 281 – 289.
Erbetta, F. & M. Cave (2007). Regulation and efficiency incentives: evidence from the England and Wales water and sewerage industry. Rev. Netw. Econ., vol.6 (4): 425-452.
Färe, R.; S. Grosskopf & C.A.K.Lovell (1994a). Production Frontiers. Cambridge University Press, Cambridge.
Frontier Economics (2003). Developing monopoly price controls workstream balancing incentives. A final report prepared forOFGEM, Standard project document, London, March.
Giannakis, D.; Jamasb, T. & M., Pollitt (2005). Benchmarking and incentive regulation of quality of service: an application to the UK electricity distribution networks, Energy Policy, vol.33: 2256–2271.
Jamasb, T. & M., Pollitt (2001). Benchmarking and regulation: international electricity experience. Utilities Policy, vol.9: 107–130.
Jamasb, T. & M., Pollitt (2007). Incentive regulation of electricity distribution networks: Lessons of experience from Britain. Energy Policy, vol.35, 6163–6187.
Jamison M. A. (2014). Regulation: Price Cap and Revenue Cap. Encyclopedia of Energy Engineering and Technology, Second Edition, DOI: 10.1081/E-EEE2-120051996.
Jensen, O., Wu., Huijuan (2018). urban water security indicators: Development and pilot. Environmental Science and Policy, vol.83: 33–45.
Johns, N.; Howcroft, B. & L., Drake (1997). The Use of Data Envelopment Analysis to Monitor Hotel Productivity. Progress in tourism and hospitality research, VOL. 3: 119–127.
Khetrapal P.; Tripta T. & A., Gupta (2017). X - factor evaluation under RPI-X regulation for Indian electricity distribution utilities. Journal of Engineering Science and Technology, Vol. 12, No. 7: 1900 – 1914.
Kuosmanen, T.; Johnson, A. & A., Saastamoinen (2015). Stochastic nonparametric approach to efficiency analysis: a unified framework. In: Zhu J (Ed.), Handbook on data envelopment analysis, Springer, New York, USA: 1-49.
Levine, G. (1982). Relative water supply: an explanatory variable for irrigation systems. Technical report No. 6. Ithaca, New York, USA, Cornell University.
Majone, G. (1993). The European Community between social policy and social regulation. Journal of Common Market Studies, vol.31(2): 153–70.
Majone, G. (1997). From the positive to the regulatory state: causes and consequences of changes in the mode of governance. Journal of Public Policy, vol.17(2): 139–67.
Marques, R. (2005). Regulac¸a˜o de Servic¸os Pu´blicos. Edic¸o˜ es Sı´labo, Lda, Lisbon, Portugal.
Marques, R. C.; Simões, P.; J.S. Pires (2011). Performance benchmarking in utility regulation: the worldwide experience. Polish J. of Environ. Stud. Vol. 20, No. 1: 125-132.
Maziotis, A.; Saal, D.S. & E. Thanassoulis (2009). Regulatory Price Performance, Excess Cost Indexes and Profitability: How Effective Is Price-cap Regulation in the Water Industry?. Aston Business School Working Papers, RP 0920.
Maziotis, A.; Saal, D.S. & Thanassoulis, E. (2012). Profit, Productivity and Price Performance Changes in the English and Welsh Water and Sewerage Companies. FEEM Working Paper, Nota Di Lavoro, No.84.
Maziotis, A.; Saal, D.S.; Thanassoulis, E. & Molinos-Senante, M. (2015). Profit, productivity and price performance changes in the water and sewerage industry: an empirical application for England and Wales. Clean Technol. Environ. Policy, vol.17:1005-1018.
Maziotisa, A.; S. Saalb, D.; Thanassoulisb, E. & Molinos-Senante, M. (2016). Price-cap regulation in the English and Welsh water industry: A proposal for measuring productivity performance. Utilities Policy , Vol.41: 22–30.
Molinos-Senante, M., Maziotis, A., Sala-Garrido, R. (2014). The Luenberger productivity indicator in the water industry: an empirical approach for England and Wales. Util. Policy, vol.30: 18-28.
Robert, A. (2001). Quality issues for system operators with special reference to European regulators. Report, Belgian Transmission System Operator (ELIA), Brussels.
Saal, D., Parker, D. and Weyman-Jones, T. (2007). Determining the contribution of technical, efficiency and scale change to productivity growth in the privatized English and Welsh water and sewerage industry: 1985-2000. Journal of Productivity Analysis, vol. 28: 127-139.
Saal, D.S.; Parker, D. & Weyman-Jones, T. (2007). determining the contribution of technical efficiency and scale change to productivity growth in the privatized English and Welsh water and sewerage industry: 1985-2000. J. Prod. Analysis, vol.28 (1): 127-139.
Saal, D.S., Reid, S. (2004). Estimating OPEX Productivity Growth in English and Welsh Water and Sewerage Companies: 1999-2003. RP0434. Aston Business School Research Papers.
United Nations Children’s Fund (UNICEF) and World Health Organization (WHO) (2017). Progress on Drinking Water, Sanitation and Hygiene: 2017 Update and SDG Baselines .
Vickers, J. & Yarrow, G. (1988a). Privatization: An Economic Analysis. MIT, Press: London, England and Cambridge Massachusetts.
Water statistics yearbook of Iran (2010-2016). http://isn.moe.gov.ir/WWCs/ Water and Waste Water sector/performance/ Water statistics yearbook of Iran.
Water statistics yearbook of Iran (2016). Water and waste water planning office of the ministry of energy, Tehran.
Woodbury, K. &, B., Dollery (2004). Efficiency measurement in Australian local government: the case of New South Wales municipal water services. Review of Policy Research, Vol.21: 615-636.
Xu, C. & Powell, R. S. (1991). Water supply system reliability: concepts and measures. Civil Engineering Systems, Vol. 8: 191-195.
Ali Nejad, Khosrow (2017), Exploring the Productivity and Quality Control of Equipment Case Study: Rural and Urban Waters and Wastewater Organization of West Azarbaijan, Master's Thesis, Urmia University of Technology, Faculty of Industry (in Persian).
Baqafam, Aziz and Mohammadzadeh, Akbar, 2016, Evaluation of the efficiency of the units covered by the water and wastewater company in East Azarbaijan, using data envelopment analysis, 6th International Accounting and Management Conference, and 3rd Opening Conference on Entrepreneurship and Innovations, Tehran, Eshragh Mehr illumination, https://www.civilica.com/Paper-MOCONF06-MOCONF06_074.html ((in Persian).
Ebadi, Jafar, Doodabi Nejad, Amir,2011, Choosing the Optimal Model for Adjusting Motivational Prices Considering Foreign Exposure to Iran's Electricity Distribution, Journal of Environmental Economics and Energy, First Year, No. 1 , pp. 172-133 (in Persian).
Rezaei, Javad, Eid Mohammadzadeh, Hasan; Faghih Nasiri, Marjan and Garshasbi, Alireza (2010), "Evaluation of the efficiency of municipal water and wastewater companies in the water sector in the provinces of Iran using linear programming model", Water resources research Iran, Year 6, No. 1, p. 74-82 ((in P.ersian)
Rezaian, Javad, Asgari-Nezhad, Abbas (2014), "Evaluation of the performance of water and wastewater companies in Mazandaran province with the help of the combined model of data envelopment analysis and artificial neural network", Industrial Engineering Journal, Farsi 48, No. 2, p. 213-201 (in Persian)
Sajjadifar, Seyyed Hossein, Khashayi, Masoud, Ebrahim Abadi, Gholamreza de Davoud Abadi, Mohammad (2018), "Analysis of Indicators of Utilization of Urban Water and Wastewater Companies", Journal of Water and wastewater (waiting print). Doi: 10.22093 / wwj.2017.87689.2416 (in Persian).
Ziba, Fatemeh, 2008, The ordering and regulation of economic regulation and the assessment of efficiency and productivity in power distribution companies in Iran, Quarterly Journal of Economic Research, Vol. 10, No. 34, p. 179-200(in Persian).