| article html file updated | 7 February 2020 21:48 CET | Update | https://www.mdpi.com/1999-4915/9/1/13 |
| article html file updated | 22 September 2019 23:15 CEST | Update | - |
| article html file updated | 4 May 2019 14:26 CEST | Update | - |
| article html file updated | 7 February 2017 12:24 CET | Update | - |
| article html file updated | 19 January 2017 12:12 CET | Original file | - |
| article xml uploaded. | 19 January 2017 12:11 CET | Original file | https://www.mdpi.com/1999-4915/9/1/13/xml |
| article pdf uploaded. | 19 January 2017 12:11 CET | Version of Record | https://www.mdpi.com/1999-4915/9/1/13/pdf |
