| article html file updated | 7 February 2020 21:06 CET | Update | https://www.mdpi.com/2079-6412/7/1/6 |
| article html file updated | 4 May 2019 16:07 CEST | Update | - |
| article html file updated | 7 February 2017 04:38 CET | Update | - |
| article html file updated | 10 January 2017 11:50 CET | Update | - |
| article html file updated | 10 January 2017 11:50 CET | Update | - |
| article html file updated | 10 January 2017 11:50 CET | Original file | - |
| article xml uploaded. | 10 January 2017 11:49 CET | Original file | https://www.mdpi.com/2079-6412/7/1/6/xml |
| article pdf uploaded. | 10 January 2017 11:49 CET | Version of Record | https://www.mdpi.com/2079-6412/7/1/6/pdf |
