| article html file updated | 7 February 2020 16:16 CET | Update | https://www.mdpi.com/2223-7747/5/4/40 |
| article html file updated | 22 September 2019 02:40 CEST | Update | - |
| article html file updated | 5 May 2019 01:49 CEST | Update | - |
| article html file updated | 29 December 2016 06:47 CET | Update | - |
| article html file updated | 13 October 2016 09:41 CEST | Original file | - |
| article xml uploaded. | 13 October 2016 09:40 CEST | Original file | https://www.mdpi.com/2223-7747/5/4/40/xml |
| article pdf uploaded. | 13 October 2016 09:40 CEST | Version of Record | https://www.mdpi.com/2223-7747/5/4/40/pdf |
