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Submitted on: 29 January 1999.
Revised on: 13 March 1999.
Accepted on: 29 March 1999.
___________________CLASSICAL AND QUANTUM GRAVITY---IOP PUBLISHING LTD
Submitted on: 30 April 2018.
Revised on: 11 June 2018.
Accepted on: 10 July 2018.
___________________CLASSICAL AND QUANTUM GRAVITY---IOP PUBLISHING LTD
Submitted on: 06 August 2024.
Revised on: 25 October 2024.
Accepted on: 17 November 2024.
___________________CLASSICAL AND QUANTUM GRAVITY---IOP PUBLISHING LTD
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Submitted on: 16 April 2023.
Revised on: 23 May 2023.
Accepted on: 12 July 2023.
___________________CLASSICAL AND QUANTUM GRAVITY---IOP PUBLISHING LTD
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