| article html file updated | 9 February 2020 02:00 CET | Update | https://www.mdpi.com/2227-9067/5/1/9 |
| article html file updated | 29 September 2019 16:15 CEST | Update | - |
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| article html file updated | 1 February 2018 07:50 CET | Update | - |
| article html file updated | 4 January 2018 12:46 CET | Original file | - |
| article xml uploaded. | 4 January 2018 12:45 CET | Original file | https://www.mdpi.com/2227-9067/5/1/9/xml |
| article pdf uploaded. | 4 January 2018 12:45 CET | Version of Record | https://www.mdpi.com/2227-9067/5/1/9/pdf |
