| article html file updated | 7 February 2020 18:31 CET | Update | https://www.mdpi.com/2227-7102/6/4/39 |
| article html file updated | 4 May 2019 21:32 CEST | Update | - |
| article html file updated | 9 November 2017 12:36 CET | Update | - |
| article html file updated | 27 October 2017 10:03 CEST | Update | - |
| article html file updated | 24 November 2016 10:00 CET | Original file | - |
| article xml uploaded. | 24 November 2016 09:58 CET | Original file | https://www.mdpi.com/2227-7102/6/4/39/xml |
| article pdf uploaded. | 24 November 2016 09:58 CET | Version of Record | https://www.mdpi.com/2227-7102/6/4/39/pdf |
