| article html file updated | 9 February 2020 06:36 CET | Update | https://www.mdpi.com/2313-433X/4/2/40 |
| article html file updated | 30 September 2019 19:07 CEST | Update | - |
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| article html file updated | 17 April 2019 17:49 CEST | Update | - |
| article html file updated | 28 March 2019 23:14 CET | Update | - |
| article html file updated | 14 March 2018 11:52 CET | Update | - |
| article html file updated | 26 February 2018 13:22 CET | Update | - |
| article xml uploaded. | 26 February 2018 13:20 CET | Update | https://www.mdpi.com/2313-433X/4/2/40/xml |
| article xml uploaded. | 26 February 2018 13:20 CET | Update | - |
| article xml uploaded. | 26 February 2018 13:20 CET | Update | - |
| article pdf uploaded. | 26 February 2018 13:20 CET | Updated version of record | https://www.mdpi.com/2313-433X/4/2/40/pdf |
| article html file updated | 13 February 2018 19:20 CET | Original file | - |
| article xml uploaded. | 13 February 2018 19:19 CET | Update | - |
| article xml uploaded. | 13 February 2018 19:19 CET | Original file | - |
| article pdf uploaded. | 13 February 2018 19:19 CET | Version of Record | https://www.mdpi.com/2313-433X/4/2/40/pdf-vor |
