| article html file updated | 8 February 2020 19:25 CET | Update | https://www.mdpi.com/2227-7390/5/4/55 |
| article html file updated | 2 May 2019 19:04 CEST | Update | - |
| article html file updated | 2 January 2018 11:34 CET | Update | - |
| article html file updated | 26 October 2017 11:24 CEST | Original file | - |
| article xml uploaded. | 26 October 2017 11:23 CEST | Original file | https://www.mdpi.com/2227-7390/5/4/55/xml |
| article pdf uploaded. | 26 October 2017 11:23 CEST | Updated version of record | https://www.mdpi.com/2227-7390/5/4/55/pdf |
| article pdf uploaded. | 25 October 2017 12:16 CEST | Version of Record | https://www.mdpi.com/2227-7390/5/4/55/pdf-vor |
