| article html file updated | 8 February 2020 17:20 CET | Update | https://www.mdpi.com/1999-5903/9/4/57 |
| article html file updated | 27 September 2019 10:11 CEST | Update | - |
| article html file updated | 2 May 2019 23:43 CEST | Update | - |
| article html file updated | 2 January 2018 11:16 CET | Update | - |
| article html file updated | 28 September 2017 09:32 CEST | Original file | - |
| article xml uploaded. | 28 September 2017 09:31 CEST | Original file | https://www.mdpi.com/1999-5903/9/4/57/xml |
| article pdf uploaded. | 28 September 2017 09:31 CEST | Updated version of record | https://www.mdpi.com/1999-5903/9/4/57/pdf |
| article pdf uploaded. | 27 September 2017 14:34 CEST | Version of Record | https://www.mdpi.com/1999-5903/9/4/57/pdf-vor |
