| article html file updated | 8 February 2020 19:37 CET | Update | https://www.mdpi.com/2226-4787/5/4/60 |
| article html file updated | 28 September 2019 01:23 CEST | Update | - |
| article html file updated | 2 May 2019 18:34 CEST | Update | - |
| article html file updated | 2 January 2018 14:24 CET | Update | - |
| article html file updated | 27 October 2017 12:14 CEST | Original file | - |
| article xml uploaded. | 27 October 2017 12:13 CEST | Original file | https://www.mdpi.com/2226-4787/5/4/60/xml |
| article pdf uploaded. | 27 October 2017 12:13 CEST | Version of Record | https://www.mdpi.com/2226-4787/5/4/60/pdf |
