| article html file updated | 7 February 2020 21:56 CET | Update | https://www.mdpi.com/1999-4915/9/1/20 |
| article html file updated | 22 September 2019 23:59 CEST | Update | - |
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| article html file updated | 7 February 2017 12:26 CET | Update | - |
| article html file updated | 21 January 2017 09:35 CET | Original file | - |
| article xml uploaded. | 21 January 2017 09:34 CET | Original file | https://www.mdpi.com/1999-4915/9/1/20/xml |
| article pdf uploaded. | 21 January 2017 09:34 CET | Version of Record | https://www.mdpi.com/1999-4915/9/1/20/pdf |
