| article html file updated | 6 February 2020 23:42 CET | Update | https://www.mdpi.com/2079-4983/6/4/999 |
| article html file updated | 21 September 2019 04:40 CEST | Update | - |
| article html file updated | 6 May 2019 09:30 CEST | Update | - |
| article html file updated | 26 March 2019 12:25 CET | Update | - |
| article html file updated | 11 December 2018 09:23 CET | Update | - |
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| article html file updated | 11 December 2018 09:13 CET | Update | - |
| article html file updated | 11 December 2018 09:01 CET | Original file | - |
| article pdf uploaded. | 13 October 2015 14:40 CEST | Version of Record | https://www.mdpi.com/2079-4983/6/4/999/pdf |
