| article html file updated | 9 February 2020 06:35 CET | Update | https://www.mdpi.com/2313-433X/4/2/39 |
| article html file updated | 30 September 2019 19:04 CEST | Update | - |
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| article html file updated | 13 February 2018 19:17 CET | Original file | - |
| article xml uploaded. | 13 February 2018 19:16 CET | Original file | https://www.mdpi.com/2313-433X/4/2/39/xml |
| article pdf uploaded. | 13 February 2018 19:16 CET | Version of Record | https://www.mdpi.com/2313-433X/4/2/39/pdf |
