| article html file updated | 9 February 2020 01:18 CET | Update | https://www.mdpi.com/2313-433X/4/1/6 |
| article html file updated | 29 September 2019 12:15 CEST | Update | - |
| article html file updated | 2 May 2019 05:55 CEST | Update | - |
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| article html file updated | 2 February 2018 09:19 CET | Update | - |
| article html file updated | 27 December 2017 07:20 CET | Original file | - |
| article xml uploaded. | 27 December 2017 07:19 CET | Update | https://www.mdpi.com/2313-433X/4/1/6/xml |
| article xml uploaded. | 27 December 2017 07:19 CET | Original file | - |
| article pdf uploaded. | 27 December 2017 07:19 CET | Version of Record | https://www.mdpi.com/2313-433X/4/1/6/pdf |
