| article html file updated | 8 February 2020 19:10 CET | Update | https://www.mdpi.com/2227-9091/5/4/56 |
| article html file updated | 27 September 2019 22:34 CEST | Update | - |
| article html file updated | 2 May 2019 19:39 CEST | Update | - |
| article html file updated | 2 January 2018 14:27 CET | Update | - |
| article html file updated | 25 October 2017 05:02 CEST | Original file | - |
| article xml uploaded. | 25 October 2017 05:01 CEST | Original file | https://www.mdpi.com/2227-9091/5/4/56/xml |
| article pdf uploaded. | 25 October 2017 05:01 CEST | Updated version of record | https://www.mdpi.com/2227-9091/5/4/56/pdf |
| article pdf uploaded. | 23 October 2017 11:28 CEST | Version of Record | https://www.mdpi.com/2227-9091/5/4/56/pdf-vor |
