| article html file updated | 8 February 2020 09:55 CET | Update | https://www.mdpi.com/2227-9067/4/7/56 |
| article html file updated | 25 September 2019 17:15 CEST | Update | - |
| article html file updated | 3 May 2019 14:23 CEST | Update | - |
| article html file updated | 28 July 2017 11:10 CEST | Update | - |
| article html file updated | 3 July 2017 17:31 CEST | Original file | - |
| article xml uploaded. | 3 July 2017 17:30 CEST | Original file | https://www.mdpi.com/2227-9067/4/7/56/xml |
| article pdf uploaded. | 3 July 2017 17:30 CEST | Updated version of record | https://www.mdpi.com/2227-9067/4/7/56/pdf |
