| article html file updated | 7 February 2020 21:47 CET | Update | https://www.mdpi.com/1999-4915/9/1/15 |
| article html file updated | 22 September 2019 23:09 CEST | Update | - |
| article html file updated | 4 May 2019 14:30 CEST | Update | - |
| article html file updated | 7 February 2017 12:25 CET | Update | - |
| article html file updated | 19 January 2017 12:34 CET | Original file | - |
| article xml uploaded. | 19 January 2017 12:33 CET | Original file | https://www.mdpi.com/1999-4915/9/1/15/xml |
| article pdf uploaded. | 19 January 2017 12:33 CET | Version of Record | https://www.mdpi.com/1999-4915/9/1/15/pdf |
