| article html file updated | 7 February 2020 20:15 CET | Update | https://www.mdpi.com/2227-7102/7/1/4 |
| article html file updated | 22 September 2019 14:54 CEST | Update | - |
| article html file updated | 4 May 2019 17:55 CEST | Update | - |
| article html file updated | 27 October 2017 09:54 CEST | Update | - |
| article html file updated | 24 December 2016 06:44 CET | Original file | - |
| article xml uploaded. | 24 December 2016 06:42 CET | Original file | https://www.mdpi.com/2227-7102/7/1/4/xml |
| article pdf uploaded. | 24 December 2016 06:42 CET | Version of Record | https://www.mdpi.com/2227-7102/7/1/4/pdf |
