Submitted on: 01 November 2022.
Revised on: 01 February 2023.
Accepted on: 11 March 2023.
___________________Ekonomika i Matematiceskie Metody-Economics and Mathematical Methods
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Submitted on: 29 September 2020.
Revised on: 22 January 2021.
Accepted on: 26 February 2021.
___________________Ekonomika i Matematiceskie Metody-Economics and Mathematical Methods
Submitted on: 27 September 1998.
Revised on: 04 December 1998.
Accepted on: 26 January 1999.
___________________Ekonomika i Matematiceskie Metody-Economics and Mathematical Methods
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