| article html file updated | 9 February 2020 12:12 CET | Update | https://www.mdpi.com/2225-1154/6/2/23 |
| article html file updated | 2 October 2019 05:00 CEST | Update | - |
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| article html file updated | 2 April 2018 23:36 CEST | Original file | - |
| article xml uploaded. | 2 April 2018 10:03 CEST | Update | https://www.mdpi.com/2225-1154/6/2/23/xml |
| article pdf uploaded. | 2 April 2018 10:03 CEST | Version of Record | https://www.mdpi.com/2225-1154/6/2/23/pdf |