Submitted on: 14 December 2015.
Revised on: 27 January 2016.
Accepted on: 10 February 2016.
Mathematics and Financial Economics
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Submitted on: 03 April 2001.
Revised on: 19 April 2001.
Accepted on: 26 April 2001.
Mathematics and Financial Economics
Submitted on: 01 November 1999.
Revised on: 26 November 1999.
Accepted on: 01 December 1999.
Mathematics and Financial Economics