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Shankar, Bhavani and Hadley, David (2005) 'On the Measurement of Subset Input Overuse using Data Envelopment Analysis.' Empirical Economics Letters, 4 (3). pp. 1-8.
Piesse, Jenifer, Hadley, David, Shankar, Bhavani and Thirtle, Colin (2002) 'The Efficiency of Input Use during the Early Transition in Hungary.' Economics of Planning, 35 (2). pp. 183-204.
Hadley, David, Shankar, Bhavani and Thirtle, Colin (1999) 'Was South African Agriculture Overcapitalized in the Apartheid Era?' Agrekon : Agricultural Economics Research, Policy and Practice in Southern Africa, 38 (4). pp. 777-787.