| article html file updated | 6 February 2020 00:37 CET | Update | https://www.mdpi.com/1422-0067/14/2/4298 | 
| article html file updated | 8 May 2019 08:15 CEST | Update | - | 
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| article pdf uploaded. | 21 February 2013 10:01 CET | Version of Record | https://www.mdpi.com/1422-0067/14/2/4298/pdf |