| article html file updated | 7 February 2020 17:26 CET | Update | https://www.mdpi.com/1424-2818/8/4/23 |
| article html file updated | 4 May 2019 23:37 CEST | Update | - |
| article html file updated | 29 December 2016 06:43 CET | Update | - |
| article html file updated | 3 November 2016 08:51 CET | Original file | - |
| article xml uploaded. | 3 November 2016 08:50 CET | Update | https://www.mdpi.com/1424-2818/8/4/23/xml |
| article xml uploaded. | 3 November 2016 08:50 CET | Original file | - |
| article pdf uploaded. | 3 November 2016 08:50 CET | Version of Record | https://www.mdpi.com/1424-2818/8/4/23/pdf |
