1. Timmer, C.P. Using a probabilistic frontier production to measure technical efficiency. Journal of Political Economy, 79 (1971), 776–794.
2. Bloomfield, P. and Steiger, W.L. Absolute Deviations: Theory, Applictaions and Algorithms, Boston: Birkhauser Publishing, 1983.
3. Dodge, Y. (ed.) Statistical Data Analysis Based on the L
1
-Norm and Related Methods, New York: Elsevier Science Pubishers, 1987.
4. Schmidt, P. and Sickles, R.C. Production frontier and panel data, Journal of Business and Economic Statistics, 2 (1984), 367–374.
5. Charnes, A., Cooper, W.W. and Rhodes, E. Measuring the efficiency of decisionmaking units, European Journal of Operational Research, 2 (1978), 429–444.