| 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 | 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 |
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| article pdf uploaded. | 26 February 2018 13:20 CET | Updated version of record | https://www.mdpi.com/2313-433X/4/2/40/pdf |
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