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Submitted on: 12 March 2009.
Revised on: 01 April 2009.
Accepted on: 29 April 2009.
Mathematical Geosciences---SPRINGER HEIDELBERG
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Submitted on: 03 June 2009.
Revised on: 27 June 2009.
Accepted on: 13 July 2009.
Mathematical Geosciences---SPRINGER HEIDELBERG
Submitted on: 19 December 2012.
Revised on: 27 January 2013.
Accepted on: 16 February 2013.
Mathematical Geosciences
Submitted on: 03 February 2006.
Revised on: 11 March 2006.
Accepted on: 01 April 2006.
Mathematical Geosciences
Submitted on: 03 April 2018.
Revised on: 06 May 2018.
Accepted on: 19 May 2018.
Mathematical Geosciences---SPRINGER HEIDELBERG
Submitted on: 24 May 2012.
Revised on: 23 June 2012.
Accepted on: 07 July 2012.
Mathematical Geosciences
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