| article html file updated | 8 February 2020 04:01 CET | Update | https://www.mdpi.com/2071-1050/9/4/657 |
| article html file updated | 24 September 2019 10:20 CEST | Update | - |
| article html file updated | 4 May 2019 01:23 CEST | Update | - |
| article html file updated | 28 April 2017 11:11 CEST | Update | - |
| article html file updated | 20 April 2017 13:34 CEST | Original file | - |
| article xml uploaded. | 20 April 2017 13:33 CEST | Original file | https://www.mdpi.com/2071-1050/9/4/657/xml |
| article pdf uploaded. | 20 April 2017 13:33 CEST | Version of Record | https://www.mdpi.com/2071-1050/9/4/657/pdf |
