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- SAHOO, Biresh K. - LUPTÁČIK, Mikuláš - MAHLBERG, Bernhard. Alternative Measures of Environmental Technology Structure in DEA: An Application. In European Journal of Operational Research. - Amsterdam : North-Holland. ISSN 0377-2217, December 2011, vol. 215, no. 3, pp. 750-762.
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- MAHLBERG, Bernhard - LUPTÁČIK, Mikuláš - SAHOO, Biresh K. Examining the Drivers of Total Factor Productivity Change with an Illustrative Example of 14 EU Countries. In Ecological Economics. - Amsterdam : Elsevier Science Publishers B.V. ISSN 1873-6106, 2011, vol. 72, pp. 60-69. Available on Internet: <www.elsevier.com/locate/ecolecon>
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