| article html file updated | 7 February 2020 20:06 CET | Update | https://www.mdpi.com/2071-1050/9/1/2 |
| article html file updated | 22 September 2019 14:08 CEST | Update | N/A |
| article html file updated | 4 May 2019 18:12 CEST | Update | N/A |
| article html file updated | 7 February 2017 09:23 CET | Update | N/A |
| article html file updated | 22 December 2016 12:16 CET | Original file | N/A |
| article xml uploaded. | 22 December 2016 12:15 CET | Original file | https://www.mdpi.com/2071-1050/9/1/2/xml |
| article pdf uploaded. | 22 December 2016 12:15 CET | Version of Record | https://www.mdpi.com/2071-1050/9/1/2/pdf |
