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Submitted on: 17 January 2010.
Revised on: 07 April 2010.
Accepted on: 28 April 2010.
___________________Erwerbs-Obstbau---SPRINGER
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Submitted on: 23 February 2017.
Revised on: 24 April 2017.
Accepted on: 01 June 2017.
___________________Erwerbs-Obstbau---SPRINGER
Submitted on: 06 October 2018.
Revised on: 20 November 2018.
Accepted on: 05 January 2019.
___________________Erwerbs-Obstbau---SPRINGER