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Submitted on: 28 February 2008.
Revised on: 15 May 2008.
Accepted on: 20 June 2008.
___________________JOURNAL OF GRAPH THEORY---WILEY
Submitted on: 14 February 2012.
Revised on: 21 March 2012.
Accepted on: 26 April 2012.
___________________JOURNAL OF GRAPH THEORY---WILEY
Submitted on: 09 July 2013.
Revised on: 23 September 2013.
Accepted on: 17 October 2013.
___________________JOURNAL OF GRAPH THEORY---WILEY
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Submitted on: 14 January 2012.
Revised on: 12 April 2012.
Accepted on: 28 May 2012.
___________________JOURNAL OF GRAPH THEORY---WILEY