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Submitted on: 14 November 2019.
Revised on: 16 December 2019.
Accepted on: 29 December 2019.
STATISTICAL PAPERS---SPRINGER
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Submitted on: 20 January 2008.
Revised on: 25 February 2008.
Accepted on: 07 March 2008.
STATISTICAL PAPERS
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Submitted on: 15 May 2012.
Revised on: 20 June 2012.
Accepted on: 28 June 2012.
STATISTICAL PAPERS
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