| article html file updated | 9 February 2020 07:37 CET | Update | https://www.mdpi.com/2305-6290/2/1/6 |
| article html file updated | 1 May 2019 16:21 CEST | Update | - |
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| article html file updated | 25 February 2018 12:09 CET | Original file | - |
| article xml uploaded. | 25 February 2018 12:08 CET | Original file | https://www.mdpi.com/2305-6290/2/1/6/xml |
| article pdf uploaded. | 25 February 2018 12:08 CET | Version of Record | https://www.mdpi.com/2305-6290/2/1/6/pdf |
