| article html file updated | 8 February 2020 06:10 CET | Update | https://www.mdpi.com/2218-1989/7/2/20 |
| article html file updated | 24 September 2019 21:31 CEST | Update | - |
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| article xml uploaded. | 18 May 2017 14:20 CEST | Update | https://www.mdpi.com/2218-1989/7/2/20/xml |
| article pdf uploaded. | 18 May 2017 14:20 CEST | Version of Record | https://www.mdpi.com/2218-1989/7/2/20/pdf |
