Adhikari, B. and G. Boag (2013). Designing payments for ecosystem services schemes: some considerations. Current Opinion in Environmental Sustainability 2013, 5, рр. 72-77.

Allen, J., J. DuVander, I. Kubiszewski, E. Ostrom (2011). Institutions for Managing Ecosystem Services Solutions, Vol. 2, 6, рр. 44-49.

Bachev, H. (2009). Governing of Agro-ecosystem Services. Modes, Efficiency, Perspectives. VDM Verlag.

Bachev, H. (2009а). Service Management of Agro-Eco-Systems. Agriculture Economics and Management, N 6, рр 3-20 (in Bulgarian).

Bachev, H. (2012). Efficiency of Farms and Agrarian Organizations. Economic Thought Journal, N 4, рр. 46-77 (in Bulgarian).

Bachev, H. (2014). Environmental management in agriculture. Economic Thought Journal, N 1, рр. 56-79.

Bachev, H. (2018): The impact of the institutional environment on agrarian sustainability in Bulgaria. Economic Thought Journal, N 4, рр. 33-60.

Bachev, H., B. Ivanov, D. Toteva (2019). An evaluation of the socio-economic and ecological sustainability of agrarian ecosystems in Bulgaria. Economic Thought Journal, N 2, рр. 57-80.

Boelee, E. (ed.) (2013). Managing water and agroecosystems for food security. CABI.

Chipev, N., S. Bratanova-Doncheva, K. Gocheva, M. Zhiyanski, M. Mondeshka, Y. Yordanov, I. Apostolova, D. Sopotlieva, N. Velev, E. Rafailova, Y. Uzunov, V. Karamfilov, R. Fikova, S. Vergiev (2017). Methodological framework for the assessment and mapping of the state of ecosystems and ecosystem services in Bulgaria. A guide for monitoring the state and development of ecosystems and ecosystem services. Executive Environment Agency (in Bulgarian).

Coase, R. (1960). The Problem of Social Cost. Journal of Law and Economics, Vol. 3, рр. 1-44.

De Groot, R., M. Wilson, R. Boumans (2002). A typology for the description, classification and valuation of ecosystem functions goods services. Ecol Econ 41, рр. 393-408.

EEA (2015). Ecosystem services in the EU.

Executive Environment Agency (2019). Ecosystems and exosystem services (in Bulgarian).

FAO (2016). Mainstreaming ecosystem services and biodiversity into agricultural production and management in East Africa. Technical guidance document.

Fremier, A., F. DeClerck, N. Bosque-Pérez, N. Carmona, R, Hill, T. Joyal, L. Keesecker, P. Klos, A. Martínez-Salinas, R. Niemeyer, A. Sanfiorenzo, K. Welsh, J. Wulfhorst (2013). Understanding Spatiotemporal Lags in Ecosystem Services to Improve Incentives. BioScience, Vol. 63, N 6.

Furuboth, E. & R. Richter (1998). Institutions and Economic Theory: The Contribution of the New Institutional Economics. Ann Arbor: The University of Michigan Press.

Gao, H., T. Fu, J. Liu, H. Liang and L. Han (2018). Ecosystem Services Management Based on Differentiation and Regionalization along Vertical Gradient. China, Sustainability, 10, 986. DOI:10.3390/su10040986.

Garbach, K., J. Milder, M. Montenegroand, F. DeClerck (2014). Biodiversity and Ecosystem Services in Agroecosystems. Elsevier.

Gemmill-Herren, B. (2018). Pollination Services to Agriculture Sustaining and enhancing a key ecosystem service. Routledge.

Grigorova Y. & Y. Kazakova (2008). High Nature Value farmlands: Recognizing the importance of South East European landscapes. Case study report, Western Stara Planina. WWF (EFNCP).

Habib, T., S. Heckbert, J. Wilson, A. Vandenbroeck, J. and D. Farr (2016). Impacts of land-use management on ecosystem services and biodiversity: an agentbased modelling approach. PeerJ 4:e2814.

INRA (2017). A framework for assessing ecosystem services from humanimpacted ecosystems. EFESE.

Kanianska, R. (2019). Agriculture and Its Impact on Land-Use, Environment, and Ecosystem Services. INTECH.

Kazakova, Y. (2016). Agriculture with high natural value (training, innovations and knowledge). Sofia: UNWE (in Bulgarian).

Laurans, Y. and L. Mermet (2014). Ecosystem services economic valuation, decision-support system or advocacy? Ecosystem Services, Vol. 7, рр. 98-105.

Lescourret, F., D. Magda, G. Richard, A. Adam-Blondon, M. Bardy, J. Baudry, I. Doussan, B. Dumont, F. Lefèvre, I. Litrico, R. Martin-Clouaire, B. Montuelle, S. Pellerin, M. Plantegenest, E. Tancoigne, A.Thomas, H. Guyomard, J. Soussana (2015). A social-ecological approach to managing multiple agro-ecosystem services. Current Opinion in Environmental Sustainability, Vol. 14, рр. 68-75.

Marta-Pedroso, C., L. Laporta, I. Gama, T. Domingos (2018). Economic valuation and mapping of Ecosystem Services in the context of protected area management. One Ecosystem 3: e26722.

MEA (2005). Millennium Ecosystem Assessment, Ecosystems and Human Well-being. Washington, DC: Island Press.

Munang, R., I. Thiaw, K. Alverson, J. Liu and Z. Han (2013). The role of ecosystem services in climate change adaptation and disaster risk reduction. Current Opinion in Environmental Sustainability, 5, рр. 47-52.

Nedkov, S. (2016). A concept for ecosystem services. Presentation at a working meeting, 31 May (in Bulgarian).

Nikolov, S. (2018). Ecosystem services and their assessment – a brief overview. Journal of the Bulgarian Geographical Society, Vol. 39, pp. 51-54 (in Bulgarian).

North, D. (1990). Institutions, Institutional Change and Economic Performance. Cambridge: Cambridge University Press.

Novikova A., L. Rocchi, V. Vitunskienė (2017). Assessing the benefit of the agroecosystem services: Lithuanian preferences using a latent class approach. Land Use Policy, Vol. 68, рр. 277-286.

Nunes, P., P. Kumar, T. Dedeurwaerdere (2014). Handbook on the Economics of Ecosystem Services and Biodiversity. Edward Elgar, Cheltenham.

Power, A. (2010). Ecosystem services and agriculture: Tradeoffs and synergies. Philos. Trans. R. Soc. Lond. B Biol. Sci. 365, рр. 2959-2971.

Scholes, R., B. Reyers, R. Biggs, M. Spierenburg and A. Duriappah (2013). Multi-scale and cross-scale assessments of social–ecological systems and their ecosystem services. Current Opinion in Environmental Sustainability, 5, рр. 6-25.

Todorova, K. (2017). Adoption of ecosystem-based measures in farmlands – new opportunities for flood risk management. Trakia Journal of Sciences, Vol. 15, 1, рр. 152-157.

Todorova, К. (2017а). Flood risk management through the ecosystem services of agricultural holdings (dissertation). UNWE (in Bulgarian).

Tsiafouli, M., E. Drakou, A. Orgiazzi, K. Hedlund and K. Ritz (2017). Optimizing the Delivery of Multiple Ecosystem Goods and Services in Agricultural Systems. Frontiers in Ecology and Evolution, Vol.5, Art. 9715.

UN (2005). The Millennium Development Goals Report. New York.

Van Oudenhoven, A. (2020). Quantifying the effects of management on ecosystem services, https://www.wur.nl/en/show/Quantifying-the-effects-of-managementon-ecosystem-services.htm.

Petteri, V., D. D’Amato, M. Forsius, P. Angelstam, C. Baessler, P. Balvanera, B. Boldgiv, P. Bourgeron, J. Dick, R. Kanka, S. Klotz, M. Maass, V. Melecis, P. Petrık, H. Shibata, J. Tang, J. Thompson and S. Zacharias (2013). Using long-term ecosystem service and biodiversity data to study the impacts and adaptation options in response to climate change: insights from the global ILTER sites network. Current Opinion in Environmental Sustainability, 5, рр. 53-66.

Wang, S., B. Fu, Y. Wei, C. Lyle (2013). Ecosystem services management: an integrated approach. Current Opinion in Environmental Sustainability, 5, рр. 11-15.

Williamson, O. (1985). The economic institutions of capitalism. Simon and Schuster.

Wood, S., D. Karp, F. DeClerck, C. Kremen, S. Naeem, C. Palm (2015). Functional traits in agriculture: agrobiodiversity and ecosystem services. Trends in Ecology & Evolution, рр. 1-9, https://dkarp.faculty.ucdavis.edu/wp-content/uploads/ sites/310/2016/01/Wood_etal_2015_TREE_FunctionalTrait.pdf.

WWF (2019). Екосистемите и техните „услуги”, https://www.wwf.bg/what_ we_do/ policy_and_green_economy/pes/ (in Bulgarian).

Yordanov, Y., D. Mihalev, V. Vasilev, S. Bratanova-Doncheva, K. Gocheva, N. Chipev (2017). Methodology for the assessment and mapping of the state of agricultural ecosystems and their services in Bulgaria. Executive Environment Agency (in Bulgarian).

Zhan, J. (ed.) (2015). Impacts of Land-use Change on Ecosystem Services, Springer.