| article html file updated | 7 February 2020 21:24 CET | Update | https://www.mdpi.com/2076-3425/7/1/9 |
| article html file updated | 22 September 2019 20:58 CEST | Update | - |
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| article html file updated | 8 February 2017 12:25 CET | Update | - |
| article html file updated | 13 January 2017 09:46 CET | Original file | - |
| article xml uploaded. | 13 January 2017 09:45 CET | Original file | https://www.mdpi.com/2076-3425/7/1/9/xml |
| article pdf uploaded. | 13 January 2017 09:45 CET | Version of Record | https://www.mdpi.com/2076-3425/7/1/9/pdf |
