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  2. Price, Juan José [Author]; Henningsen, Arne [Author]

    A ray-based input distance function to model zero-valued output quantities : derivation and an empirical application

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    Frederiksberg, Denmark: Department of Food and Resource Economics (IFRO), University of Copenhagen, June 2022

    Published in: Københavns Universitet: IFRO working paper ; 2022,3

  5. Czekaj, Tomasz Gerard [Author]

    Measuring the Technical Efficiency of Farms Producing Environmental Output: Parametric and Semiparametric Estimation of Multi-output Stochastic Ray Production Frontiers

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    Copenhagen: University of Copenhagen, Department of Food and Resource Economics (IFRO), 2013

  7. Tsionas, Efthymios G. [Author]; Izzeldin, Marwan [Author]; Henningsen, Arne [Author]; Paravalos, Evaggelos [Author]

    Estimating stochastic ray production frontiers

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    Frederiksberg, Denmark: Department of Food and Resource Economics (IFRO), University of Copenhagen, September 2019

    Published in: Københavns Universitet: IFRO working paper ; 2019,6