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Submitted on: 06 December 2005.
Revised on: 14 January 2006.
Accepted on: 28 January 2006.
STATISTICS & PROBABILITY LETTERS
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Submitted on: 30 June 2023.
Revised on: 10 July 2023.
Accepted on: 29 July 2023.
STATISTICS & PROBABILITY LETTERS
Submitted on: 14 October 2011.
Revised on: 19 November 2011.
Accepted on: 08 December 2011.
STATISTICS & PROBABILITY LETTERS
Submitted on: 08 February 1998.
Revised on: 08 March 1998.
Accepted on: 18 March 1998.
STATISTICS & PROBABILITY LETTERS