| article html file updated | 7 February 2020 20:53 CET | Update | https://www.mdpi.com/2072-6651/9/1/20 |
| article html file updated | 22 September 2019 18:23 CEST | Update | - |
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| article xml uploaded. | 6 January 2017 05:10 CET | Update | https://www.mdpi.com/2072-6651/9/1/20/xml |
| article pdf uploaded. | 6 January 2017 05:10 CET | Version of Record | https://www.mdpi.com/2072-6651/9/1/20/pdf |
