| article html file updated | 7 February 2020 19:28 CET | Update | https://www.mdpi.com/2223-7747/5/4/44 |
| article html file updated | 4 May 2019 19:34 CEST | Update | - |
| article html file updated | 29 December 2016 06:48 CET | Update | - |
| article html file updated | 13 December 2016 09:41 CET | Original file | - |
| article xml uploaded. | 13 December 2016 09:40 CET | Original file | https://www.mdpi.com/2223-7747/5/4/44/xml |
| article pdf uploaded. | 13 December 2016 09:40 CET | Updated version of record | https://www.mdpi.com/2223-7747/5/4/44/pdf |
| article pdf uploaded. | 11 December 2016 09:05 CET | Version of Record | https://www.mdpi.com/2223-7747/5/4/44/pdf-vor |
