| article html file updated | 7 February 2020 21:19 CET | Update | https://www.mdpi.com/1999-5903/9/1/2 |
| article html file updated | 4 May 2019 15:37 CEST | Update | - |
| article html file updated | 30 March 2017 03:33 CEST | Update | - |
| article html file updated | 12 January 2017 10:40 CET | Original file | - |
| article xml uploaded. | 12 January 2017 10:39 CET | Original file | https://www.mdpi.com/1999-5903/9/1/2/xml |
| article pdf uploaded. | 12 January 2017 10:39 CET | Version of Record | https://www.mdpi.com/1999-5903/9/1/2/pdf |
