| article html file updated | 8 February 2020 20:34 CET | Update | https://www.mdpi.com/2227-9091/5/4/60 |
| article html file updated | 28 September 2019 07:23 CEST | Update | - |
| article html file updated | 2 May 2019 16:24 CEST | Update | - |
| article html file updated | 2 January 2018 14:27 CET | Update | - |
| article html file updated | 8 November 2017 13:41 CET | Original file | - |
| article xml uploaded. | 8 November 2017 13:40 CET | Original file | https://www.mdpi.com/2227-9091/5/4/60/xml |
| article pdf uploaded. | 8 November 2017 13:40 CET | Updated version of record | https://www.mdpi.com/2227-9091/5/4/60/pdf |
| article pdf uploaded. | 7 November 2017 13:17 CET | Version of Record | https://www.mdpi.com/2227-9091/5/4/60/pdf-vor |
