| article html file updated | 9 February 2020 05:14 CET | Update | https://www.mdpi.com/2227-9067/5/2/20 |
| article html file updated | 30 September 2019 10:50 CEST | Update | N/A |
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| article xml uploaded. | 2 February 2018 12:11 CET | Update | https://www.mdpi.com/2227-9067/5/2/20/xml |
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| article pdf uploaded. | 1 February 2018 17:10 CET | Version of Record | https://www.mdpi.com/2227-9067/5/2/20/pdf |
