| article html file updated | 23 February 2021 07:25 CET | Update | https://www.mdpi.com/2079-3200/2/1/4 |
| article html file updated | 6 February 2020 07:11 CET | Update | - |
| article html file updated | 20 September 2019 05:47 CEST | Update | - |
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| article html file updated | 19 August 2015 20:02 CEST | Update | - |
| article html file updated | 10 November 2014 07:35 CET | Original file | - |
| article xml file uploaded | 10 November 2014 07:35 CET | Original file | https://www.mdpi.com/2079-3200/2/1/4/xml |
| article pdf uploaded. | 11 February 2014 10:46 CET | Version of Record | https://www.mdpi.com/2079-3200/2/1/4/pdf |
