| article html file updated | 7 February 2020 21:20 CET | Update | https://www.mdpi.com/2079-9268/7/1/2 |
| article html file updated | 22 September 2019 20:38 CEST | Update | - |
| article html file updated | 4 May 2019 15:36 CEST | Update | - |
| article html file updated | 12 January 2017 11:12 CET | Original file | - |
| article xml uploaded. | 12 January 2017 11:11 CET | Original file | https://www.mdpi.com/2079-9268/7/1/2/xml |
| article pdf uploaded. | 12 January 2017 11:11 CET | Version of Record | https://www.mdpi.com/2079-9268/7/1/2/pdf |
