| article html file updated | 7 February 2020 20:13 CET | Update | https://www.mdpi.com/2071-1050/9/1/15 |
| article html file updated | 22 September 2019 14:44 CEST | Update | - |
| article html file updated | 4 May 2019 17:59 CEST | Update | - |
| article html file updated | 7 February 2017 09:33 CET | Update | - |
| article html file updated | 23 December 2016 11:57 CET | Original file | - |
| article xml uploaded. | 23 December 2016 11:55 CET | Original file | https://www.mdpi.com/2071-1050/9/1/15/xml |
| article pdf uploaded. | 23 December 2016 11:54 CET | Version of Record | https://www.mdpi.com/2071-1050/9/1/15/pdf |
