| article html file updated | 8 February 2020 19:23 CET | Update | https://www.mdpi.com/1999-5903/9/4/68 |
| article html file updated | 27 September 2019 23:51 CEST | Update | - |
| article html file updated | 2 May 2019 19:08 CEST | Update | - |
| article html file updated | 2 January 2018 11:17 CET | Update | - |
| article html file updated | 25 October 2017 11:08 CEST | Original file | - |
| article xml uploaded. | 25 October 2017 11:07 CEST | Original file | https://www.mdpi.com/1999-5903/9/4/68/xml |
| article pdf uploaded. | 25 October 2017 11:07 CEST | Version of Record | https://www.mdpi.com/1999-5903/9/4/68/pdf |
