| article html file updated | 8 February 2020 18:25 CET | Update | https://www.mdpi.com/1999-5903/9/4/63 |
| article html file updated | 27 September 2019 18:09 CEST | Update | - |
| article html file updated | 2 May 2019 21:23 CEST | Update | - |
| article html file updated | 2 January 2018 11:17 CET | Update | - |
| article html file updated | 16 October 2017 08:21 CEST | Original file | - |
| article xml uploaded. | 16 October 2017 08:19 CEST | Original file | https://www.mdpi.com/1999-5903/9/4/63/xml |
| article pdf uploaded. | 16 October 2017 08:19 CEST | Updated version of record | https://www.mdpi.com/1999-5903/9/4/63/pdf |
| article pdf uploaded. | 13 October 2017 13:34 CEST | Version of Record | https://www.mdpi.com/1999-5903/9/4/63/pdf-vor |
