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Submitted on: 06 April 2018.
Revised on: 04 July 2018.
Accepted on: 16 August 2018.
___________________BIOMETRIKA---OXFORD UNIV PRESS
Submitted on: 24 September 2020.
Revised on: 21 December 2020.
Accepted on: 05 February 2021.
___________________BIOMETRIKA---OXFORD UNIV PRESS
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Submitted on: 20 April 1998.
Revised on: 11 August 1998.
Accepted on: 20 September 1998.
___________________BIOMETRIKA---OXFORD UNIV PRESS