Nunamaker TR (1983). “Measuring Routine Nursing Service Efficiency: A Comparison of Cost Per Patient Day and Data Envelopment Analysis Models.” HEALTH SERVICES RESEARCH 18 (2): 183-208.

Nunamaker TR (1985). “Using Data Envelopment Analysis to Measure the Efficiency of Non-Profit Organizations: A Critical Evaluation.” Managerial and Decision Economics 6(1): 50-58.

Noguchi H, M Ogawa and H Ishii (2002). “The Appropriate Total Ranking Method Using DEA for Multiple Categorized Purposes.” J Computational and Applied Mathematics 146(1): 155-166.

Nolan JF (1996). “Determinants of Productive Efficiency in Urban Transit.” Logistics and Transportation Review 32(3): 319-342.

Nolan JF, PC Ritchie and JE Rowcroft (2002). “Identifying and Measuring Public Policy Goals: Istea and the US Bus Transit Industry.” J Economic Behaviour and Organization 48(3): 291-304.

Nolan JF, PC Ritchie and JR Rowcroft (2001). “Measuring Efficiency in the Public Sector Using Nonparametric Frontier Estimators: A Study of Transit Agencies in the USA.” Appl Econ 33(7): 913-922.

Nold Hughes PA and ME Edwards (2000). “Leviathan vs. Lilliputian: A Data Envelopment Analysis of Government Efficiency.” J Regional Science 40(4).

Norman M and B Stoker (1991). Data Envelopment Analysis: the Assessment of Performance. New York, USA, Wiley.

Norman M and B Stoker (1991). “Performance, Efficiency and Data Envelopment Analysis.” in Norman M and B Stoker (eds.) Data Envelopment Analysis: the Assessment of Performance Wiley: 1-20.

Norsworthy JR and SL Jang (1992). Empirical Measurement and Analysis of Productivity and Technological Change. Amsterdam, Netherlands, North-Holland.