| article html file updated | 8 February 2020 21:06 CET | Update | https://www.mdpi.com/2313-433X/3/4/51 |
| article html file updated | 28 September 2019 10:59 CEST | Update | - |
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| article html file updated | 6 February 2018 10:40 CET | Update | - |
| article html file updated | 14 November 2017 09:32 CET | Original file | - |
| article xml uploaded. | 14 November 2017 09:31 CET | Original file | https://www.mdpi.com/2313-433X/3/4/51/xml |
| article pdf uploaded. | 14 November 2017 09:31 CET | Version of Record | https://www.mdpi.com/2313-433X/3/4/51/pdf |
