| article html file updated | 7 February 2020 17:15 CET | Update | https://www.mdpi.com/2075-4450/7/4/60 |
| article html file updated | 22 September 2019 04:18 CEST | Update | - |
| article html file updated | 4 May 2019 23:57 CEST | Update | - |
| article html file updated | 29 December 2016 04:31 CET | Update | - |
| article html file updated | 31 October 2016 10:41 CET | Original file | - |
| article xml uploaded. | 31 October 2016 10:40 CET | Original file | https://www.mdpi.com/2075-4450/7/4/60/xml |
| article pdf uploaded. | 31 October 2016 10:40 CET | Version of Record | https://www.mdpi.com/2075-4450/7/4/60/pdf |
