| article html file updated | 9 February 2020 03:51 CET | Update | https://www.mdpi.com/1999-4907/9/1/39 |
| article html file updated | 30 September 2019 02:42 CEST | Update | - |
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| article html file updated | 1 February 2018 13:02 CET | Update | - |
| article html file updated | 22 January 2018 10:09 CET | Original file | - |
| article xml uploaded. | 22 January 2018 10:07 CET | Original file | https://www.mdpi.com/1999-4907/9/1/39/xml |
| article pdf uploaded. | 22 January 2018 10:07 CET | Version of Record | https://www.mdpi.com/1999-4907/9/1/39/pdf |
