| article html file updated | 7 February 2020 21:54 CET | Update | https://www.mdpi.com/1999-4915/9/1/18 |
| article html file updated | 22 September 2019 23:46 CEST | Update | - |
| article html file updated | 4 May 2019 14:15 CEST | Update | - |
| article html file updated | 7 February 2017 12:25 CET | Update | - |
| article html file updated | 20 January 2017 12:14 CET | Original file | - |
| article xml uploaded. | 20 January 2017 12:13 CET | Original file | https://www.mdpi.com/1999-4915/9/1/18/xml |
| article pdf uploaded. | 20 January 2017 12:13 CET | Version of Record | https://www.mdpi.com/1999-4915/9/1/18/pdf |
