| article html file updated | 7 February 2020 21:52 CET | Update | https://www.mdpi.com/2073-4360/9/1/31 |
| article html file updated | 22 September 2019 23:35 CEST | Update | - |
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| article html file updated | 7 February 2017 10:32 CET | Update | - |
| article html file updated | 20 January 2017 12:38 CET | Original file | - |
| article xml uploaded. | 20 January 2017 12:37 CET | Original file | https://www.mdpi.com/2073-4360/9/1/31/xml |
| article pdf uploaded. | 20 January 2017 12:37 CET | Version of Record | https://www.mdpi.com/2073-4360/9/1/31/pdf |
