| article html file updated | 23 February 2021 07:36 CET | Update | https://www.mdpi.com/2079-3200/6/2/21 |
| article html file updated | 9 February 2020 12:26 CET | Update | - |
| article html file updated | 1 May 2019 06:16 CEST | Update | - |
| article html file updated | 17 April 2019 06:21 CEST | Update | - |
| article html file updated | 29 March 2019 12:31 CET | Update | - |
| article html file updated | 4 April 2018 08:52 CEST | Original file | - |
| article xml uploaded. | 4 April 2018 06:16 CEST | Original file | https://www.mdpi.com/2079-3200/6/2/21/xml |
| article pdf uploaded. | 4 April 2018 06:16 CEST | Version of Record | https://www.mdpi.com/2079-3200/6/2/21/pdf |
