Submitted on: 09 May 2017.
Revised on: 30 July 2017.
Accepted on: 11 August 2017.
___________________GEOMETRIAE DEDICATA---SPRINGER
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Submitted on: 27 June 2012.
Revised on: 05 September 2012.
Accepted on: 03 October 2012.
___________________GEOMETRIAE DEDICATA---SPRINGER
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