| article html file updated | 8 February 2020 19:04 CET | Update | https://www.mdpi.com/1999-5903/9/4/66 |
| article html file updated | 27 September 2019 22:05 CEST | Update | - |
| article html file updated | 2 May 2019 19:51 CEST | Update | - |
| article html file updated | 2 January 2018 11:17 CET | Update | - |
| article html file updated | 21 October 2017 09:53 CEST | Original file | - |
| article xml uploaded. | 21 October 2017 09:51 CEST | Original file | https://www.mdpi.com/1999-5903/9/4/66/xml |
| article pdf uploaded. | 21 October 2017 09:51 CEST | Version of Record | https://www.mdpi.com/1999-5903/9/4/66/pdf |
