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Submitted on: 07 April 2017.
Revised on: 21 June 2017.
Accepted on: 04 July 2017.
___________________Annals of Finance---SPRINGER HEIDELBERG
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Submitted on: 25 May 1999.
Revised on: 20 July 1999.
Accepted on: 01 September 1999.
___________________Annals of Finance---SPRINGER HEIDELBERG