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Submitted on: 11 March 2004.
Revised on: 27 June 2004.
Accepted on: 16 July 2004.
___________________JOURNAL OF PRODUCTIVITY ANALYSIS
Submitted on: 17 June 2011.
Revised on: 29 August 2011.
Accepted on: 11 October 2011.
___________________JOURNAL OF PRODUCTIVITY ANALYSIS
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Submitted on: 14 August 2020.
Revised on: 10 November 2020.
Accepted on: 05 January 2021.
___________________JOURNAL OF PRODUCTIVITY ANALYSIS
Submitted on: 12 July 2018.
Revised on: 14 August 2018.
Accepted on: 19 September 2018.
___________________JOURNAL OF PRODUCTIVITY ANALYSIS