| article html file updated | 8 February 2020 21:35 CET | Update | https://www.mdpi.com/2223-7747/6/4/57 |
| article html file updated | 28 September 2019 14:02 CEST | Update | - |
| article html file updated | 2 May 2019 14:07 CEST | Update | - |
| article html file updated | 18 April 2019 11:46 CEST | Update | - |
| article html file updated | 2 January 2018 20:19 CET | Update | - |
| article html file updated | 19 November 2017 10:00 CET | Original file | - |
| article xml uploaded. | 19 November 2017 09:59 CET | Original file | https://www.mdpi.com/2223-7747/6/4/57/xml |
| article pdf uploaded. | 19 November 2017 09:59 CET | Updated version of record | https://www.mdpi.com/2223-7747/6/4/57/pdf |
| article pdf uploaded. | 18 November 2017 12:06 CET | Version of Record | https://www.mdpi.com/2223-7747/6/4/57/pdf-vor |
