Submitted on: 09 February 2012.
Revised on: 05 June 2012.
Accepted on: 03 August 2012.
___________________CATENA---ELSEVIER
Submitted on: 22 March 2014.
Revised on: 09 May 2014.
Accepted on: 23 June 2014.
___________________CATENA---ELSEVIER
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Submitted on: 20 August 2010.
Revised on: 15 September 2010.
Accepted on: 29 September 2010.
___________________CATENA---ELSEVIER
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