| article html file updated | 8 February 2020 04:04 CET | Update | https://www.mdpi.com/2071-1050/9/4/648 |
| article html file updated | 24 September 2019 10:33 CEST | Update | - |
| article html file updated | 4 May 2019 01:19 CEST | Update | - |
| article html file updated | 28 April 2017 11:10 CEST | Update | - |
| article html file updated | 21 April 2017 06:24 CEST | Original file | - |
| article xml uploaded. | 21 April 2017 06:23 CEST | Original file | https://www.mdpi.com/2071-1050/9/4/648/xml |
| article pdf uploaded. | 21 April 2017 06:23 CEST | Version of Record | https://www.mdpi.com/2071-1050/9/4/648/pdf |
