Submitted on: 24 May 2022.
Revised on: 30 August 2022.
Accepted on: 25 October 2022.
___________________CLASSICAL AND QUANTUM GRAVITY---IOP PUBLISHING LTD
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Submitted on: 10 January 2012.
Revised on: 17 February 2012.
Accepted on: 11 March 2012.
___________________CLASSICAL AND QUANTUM GRAVITY---IOP PUBLISHING LTD
Submitted on: 31 October 2013.
Revised on: 28 January 2014.
Accepted on: 24 February 2014.
___________________CLASSICAL AND QUANTUM GRAVITY---IOP PUBLISHING LTD