Sieber L (2001). “Measurement of Eco-Efficiency Using Data Envelopment Analysis.” Elektrotechnik und Informationstechnik 118(4): 185-191.

Sieber L (2001). “Measurement of Eco-Efficiency Using Data Envelopment Analysis.” Elektrotechnik und Informationstechnik 118(4): 185-191.

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