Puyenbroeck LC (1998). “Non-Radial Efficiency as Semi-Radial Efficiency.” in Westermann G (eds.) Data Envelopment Analysis in the Service Sector, Wiesbaden: 51-64.

Puyenbroeck LC (1998). “Non-Radial Efficiency as Semi-Radial Efficiency.” in Westermann G (eds.) Data Envelopment Analysis in the Service Sector, Wiesbaden: 51-64.

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