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Submitted on: 10 October 2019.
Revised on: 19 December 2019.
Accepted on: 03 January 2020.
___________________Empirical Economics---PHYSICA-VERLAG GMBH & CO
Submitted on: 16 December 2016.
Revised on: 05 February 2017.
Accepted on: 24 March 2017.
___________________Empirical Economics---PHYSICA-VERLAG GMBH & CO
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Submitted on: 23 January 2024.
Revised on: 03 May 2024.
Accepted on: 03 June 2024.
___________________Empirical Economics---PHYSICA-VERLAG GMBH & CO
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Submitted on: 13 May 2003.
Revised on: 24 July 2003.
Accepted on: 25 August 2003.
___________________Empirical Economics---PHYSICA-VERLAG GMBH & CO