Aghaei, M., and Rezagholizadeh, M. 2011. Iran's comparative advantage in production of saffron. Journal of Agricultural Economics and Development (Science and Technology) 25 (1): 121-132. (In Persian with English Summary).
Aigner, D.J., and Chu, S.F. 1968. On estimating the industry production function. The American Economic Review 58 (4): 826-839.
Akbari, H., Akbari, Z., and Alireza Loo, A. 2013. A discussion study of comparative advantage of Iranian saffron export. First National Conference on Management and Accounting in the New World of Business, Economics and Culture Ali Abad, Iran, 29 August 2013. (In Persian).
Bakhtiari, A.A., Hematian, A., and Sharifi, A. 2015. Energy analyses and greenhouse gas emissions assessment for saffron production cycle. Environmental Science and Pollution Research 22 (20): 16184-16201.
Brentrup, F., Kusters, J., Kuhlmann, H., and Lammel, J. 2004. Environmental impact assessment of agricultural production systems using the life cycle assessment methodology: I. Theoretical concept of a LCA method tailored to crop production. European Journal of Agronomy 20 (3): 247-264.
Christenson, L.R., Jorgenson, D.W., and Lau, L.J. 1971. Conjugate duality and the transcendental logarithmic function. Econometrica 39 (4): 255-256.
Coelli, T., and Perelman, S. 1999. A comparison of parametric and non-parametric distance functions: With application to European railways. European Journal of Operational Research 117 (2): 326-339.
Coelli, T., Perelman, S., and Romano, E. 1999. Accounting for environmental influences in stochastic frontier models: with application to international airlines. Journal of Productivity Analysis 11 (3): 251-273.
Ebrahimi, A., Bouzarjamhari, P., and Razavani Moghaddam, P. 2009. The role of crop cultivation of saffron in rural economy. M.Sc. Thesis, Faculty of Literature and Humanities, Ferdowsi University of Mashhad, Iran. (In Persian with English Summary).
Eslami, I., Mehrabi, A., Zehtabian, GH., and GHorbani, M. 2012. Estimation of agricultural water demand function in pomegranate gardens in Charkhob Village of Yazd. Journal of Rangeland and Watershed Management. Iranian Journal of Natural Resources 66 (1): 17-26. (In Persian).
Fare, R., Grosskopf, S., Lovell, C.K., and Yaisawarng, S. 1993. Derivation of shadow prices for undesirable outputs: a distance function approach. The Review of Economics and Statistics 374-380.
Fare, R., and Primont, D. 1995. Multi-output Production and Duality: Theory and Applications. Kluwer Academic Publishers, Massachusetts.
Ghorbani, M., Darijani, A.S., Koocheki, A.S., and Motallbi, M. 2008. Estimated environmental costs of greenhouse gas emissions in dairy cattle of Mashhad. Agricultural Economics and Development 17 (66): 43-68. (In Persian).
Griffin, R.C., Montgomery, J.M., and Rister, M.E. 1987. Selecting functional form in production function analysis. Western Journal of Agricultural Economics 216-227.
Grosskopf, S. 1996. Statistical inference and nonparametric efficiency: A selective survey. Journal of Productivity Analysis 7 (2): 161-176.
Halter, A.N., Carter, H.O., and Hocking, J.G. 1957. A Note on the Transcendental Production Function cx 1 a 1 e b 1 x 1 x 2 a 2 e b 2 x 2. Journal of Farm Economics 39 (4): 966-974.
Huang, H., and Leung, P. 2007. Modeling protected species as an undesirable output: The case of sea turtle interactions in Hawaii's longline fishery. Journal of Environmental Management 84 (4): 523-533.
ISO, I. 2006. 14040: Environmental management–life cycle assessment–principles and framework. London: British Standards Institution.
Kafi, M., Hemmati Kakhki, A., and Karbasi, A. 2002. History, Economic Significance and Area under Cultivation, Production and Applications of saffron Iran, Technology of Production and Processing. Ferdowsi University Press, Mashhad. p. 21-38. (In Persian).
Karbasi, A., and Rategaripour, F. 2014. Evaluation of comparative advantage on production and export of saffron. Saffron Agriculture and Technology Journal 2 (1): 59-74. (In Persian with English Summary).
Khanali, M., Elhami, A., and Movahedi, M. 2015. Evaluation of energy and environmental indicators of saffron production in Southern Khorasan Province by Life Cycle Assessment Method (Case Study: Birjand). International Conference on Science, Engineering and Environmental Technologies, Tehran, Iran, 15-16 May 2015. (In Persian).
Khanali, M., Farahani, S.S., Shojaei, H., and Elhami, B. 2017. Life cycle environmental impacts of saffron production in Iran. Environmental Science and Pollution Research 24: 4812–4821.
Khanali, M., Movahedi, M., Yousefi, M., Jahangiri, S., and Khoshnevisan, B., 2016. Investigating energy balance and carbon footprint in saffron cultivation–a case study in Iran. Journal of Cleaner Production 115: 162-171.
Khorramdel, S., Abolhassani, L., and Azam Rahmati, A. 2016. The investigating environmental impact of saffron production system using life cycle assessment method (Case Study: Torbat-e Heydarieh and Qaen). Saffron Research Journal (Two Quarterly) 4 (2): 248-292. (In Persian with English Summary).
Khorramdel, S., and Gholizadegan, E. 2016. Study of greenhouse gas emissions and global warming potential of potato production systems. The first international conference and the 4th National Conference on Environmental Research and Agriculture in Iran, 5 November 2016. (In Persian).
Khorramdel, S., Rezvani Moghadam, P., Amin Ghafouri, A., and Golizadegan Ehsan Abad, AS. 2014. Life Cycle Assessment (LCA) of wheat production systems in the country. First National Congress on Food Health: Production, Conversion, Consumption, Karaj, Iran, 24 October 2014. (In Persian).
Khorramdel, S., Rezvani Moghadam, P., and Amin Ghafouri, A. 2017. Economic evaluation of services and functions of saffron production systems in Khorasan Razavi province. Scientific Journal of Saffron Agriculture and Technology. (In Persian with English Summary).
Kozehgaran, S., Mousavi Baygi, M., Sanaee Nejad, H., and Behdani M. 2011. Survey the minimum, Average and maximum temperature in South Khorasan to identify areas susceptible to cultivating saffron using GIS. Water and Soil Journal (Science and Technology) 25 (4): 895-907. (In Persian with English Summary).
Mola Filabi, A., Khoramdel, S., Aminghafori, A., and Hosseini, M., 2015. Evaluation of environmental impacts for saffron agroecosystems of Khorasan based on nitrogen fertilizer by using Life Cycle Assessment (LCA). Journal of Saffron Research 2 (2): 152-166. (In Persian with English Summary).
Molaei, M., Hesari, N., and Javanbakht, A. 2017. Estimation of environmental efficiency of input-oriented agricultural products (Case Study: environmental efficiency of rice production). Journal of Agricultural Economics 11 (2): 157-172. (In Persian).
Muthu, S.S. 2014. Assessment of carbon footprint in different industrial sectors (2). Springer Science and Business.
Najarzadeh, R., Reed, M.R., Saghaian, S.H., Aghaei, M., and Rezagholizadeh, M. 2010. A Study of Iran’s Comparative Advantage in Saffron, the Red Gold. Agricultural and Applied Economics Association, In 2010 Annual Meeting, Denver, Colorado (No. 61583), USA, 25-27 July 2010.
Nalabandi, L., Dashti, GH., and Ajali, J. 2014. Comparative assessment of factors using economy of wheat production in small and large farms of Ahar County. Journal of Agricultural Science and Sustainable Production 23 (2): 85-96. (In Persian with English Summary).
Nikkhah, A., Emadi, B., and Firouzi, S. 2015. Greenhouse gas emissions footprint of agricultural production in Guilan province of Iran. Sustainable Energy Technologies and Assessments 12: 10-14.
O’Brien, D., Shalloo, L., Crosson, P., Donnellan, T., Farrelly, N., Finnan, J., Hanrahan, K., Lalor, S., Lanigan, G., Thorne, F., and Schulte, R. 2014. An evaluation of the effect of greenhouse gas accounting methods on a marginal abatement cost curve for Irish agricultural greenhouse gas emissions. Environmental Science and Policy 39: 107-118.
Saffron Institute. 2013. Article. Available at website http://si.torbath.ac.ir/article
Sardashi Hatami, Z., Bakhshi, M., and Jami Al ahmadi, M. 2014. Economic analysis of saffron production in Southern Khorasan Province. Ecological Agriculture Magazine 4 (1): 33-42. (In Persian with English Summary).
Smith, S.M. 2013. Determining Sample Size. Retrieved February, 23.
Soltani, A., Bazrgar, A., Koocheki, A., Zeinali, A., Ghaemi, A.S., and Hajjarpour, A. 2015. Life Cycle Assessment (LCA) in different systems in Khorasan. Journal of Crops Production 8 (1): 43-62. (In Persian with English Summary).
Tohidi, Z. 2014. Study of how to plant and harvest saffron in Iran. Third National Conference Scientific and Research Achievements on saffron, Torbat-e Heydarieh, Iran, 5-6 December 2014. (In Persian).
Tosan, M., Alizadeh, A., Ansari, H., and Rezvani Moghaddam, P. 2015. Performance evaluation identification of susceptible areas of saffron cultivation in Khorasan Razavi province based on temperature indices. Saffron Agriculture and Technology Journal 3 (1): 1-12. (In Persian with English Summary).
International Energy Agency (IEA). 2016. Statistics. Available at Website www.iea.org
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