Mußhoff, Oliver, Norbert Hirschauer, and Michael Herink. “Bei Welchen Problemstrukturen Sind Data-Envelopment-Analysen Sinnvoll? Eine Kritische Würdigung”. German Journal of Agricultural Economics 58, no. 2 (February 19, 2009). Accessed December 19, 2025. https://www.tib-op.org/ojs/index.php/gjae/article/view/1743.