| article html file updated | 23 February 2021 07:27 CET | Update | https://www.mdpi.com/2079-3200/4/1/3 |
| article html file updated | 7 February 2020 04:40 CET | Update | - |
| article html file updated | 21 September 2019 11:28 CEST | Update | - |
| article html file updated | 6 May 2019 00:06 CEST | Update | - |
| article html file updated | 26 March 2019 20:56 CET | Original file | - |
| article pdf uploaded. | 17 February 2016 10:40 CET | Version of Record | https://www.mdpi.com/2079-3200/4/1/3/pdf |
| article xml uploaded. | 17 February 2016 10:40 CET | Original file | https://www.mdpi.com/2079-3200/4/1/3/xml |
