| article html file updated | 9 February 2020 00:52 CET | Update | https://www.mdpi.com/1424-8220/18/1/20 |
| article html file updated | 29 September 2019 09:53 CEST | Update | - |
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| article html file updated | 22 December 2017 09:10 CET | Original file | - |
| article xml uploaded. | 22 December 2017 09:09 CET | Original file | https://www.mdpi.com/1424-8220/18/1/20/xml |
| article pdf uploaded. | 22 December 2017 09:09 CET | Version of Record | https://www.mdpi.com/1424-8220/18/1/20/pdf |
