Submitted on: 24 January 2013.
Revised on: 10 February 2013.
Accepted on: 28 February 2013.
STATISTICAL PAPERS
Submitted on: 26 March 1999.
Revised on: 06 April 1999.
Accepted on: 13 April 1999.
STATISTICAL PAPERS---SPRINGER
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Submitted on: 19 August 2011.
Revised on: 22 September 2011.
Accepted on: 04 October 2011.
STATISTICAL PAPERS
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