Submitted on: 07 January 2019.
Revised on: 27 January 2019.
Accepted on: 08 February 2019.
___________________ENDEAVOUR---PERGAMON-ELSEVIER SCIENCE LTD
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Submitted on: 19 January 1999.
Revised on: 12 May 1999.
Accepted on: 11 July 1999.
___________________ENDEAVOUR---PERGAMON-ELSEVIER SCIENCE LTD
Submitted on: 02 May 2023.
Revised on: 15 July 2023.
Accepted on: 01 August 2023.
___________________ENDEAVOUR---PERGAMON-ELSEVIER SCIENCE LTD
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Submitted on: 12 September 2021.
Revised on: 16 October 2021.
Accepted on: 08 December 2021.
___________________ENDEAVOUR---PERGAMON-ELSEVIER SCIENCE LTD