Submitted on: 23 March 2013.
Revised on: 21 June 2013.
Accepted on: 10 August 2013.
___________________Applied Geomatics---SPRINGER HEIDELBERG
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Submitted on: 26 February 2012.
Revised on: 07 May 2012.
Accepted on: 25 May 2012.
___________________Applied Geomatics---SPRINGER HEIDELBERG
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Submitted on: 17 April 2019.
Revised on: 14 May 2019.
Accepted on: 30 June 2019.
___________________Applied Geomatics---SPRINGER HEIDELBERG
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Submitted on: 20 June 2020.
Revised on: 20 September 2020.
Accepted on: 22 October 2020.
___________________Applied Geomatics---SPRINGER HEIDELBERG