| article html file updated | 8 February 2020 19:20 CET | Update | https://www.mdpi.com/1999-5903/9/4/69 |
| article html file updated | 27 September 2019 23:33 CEST | Update | - |
| article html file updated | 2 May 2019 19:16 CEST | Update | - |
| article html file updated | 2 January 2018 11:17 CET | Update | - |
| article html file updated | 24 October 2017 15:13 CEST | Original file | - |
| article xml uploaded. | 24 October 2017 15:12 CEST | Update | https://www.mdpi.com/1999-5903/9/4/69/xml |
| article xml uploaded. | 24 October 2017 15:12 CEST | Original file | - |
| article pdf uploaded. | 24 October 2017 15:12 CEST | Version of Record | https://www.mdpi.com/1999-5903/9/4/69/pdf |
