| article html file updated | 8 February 2020 02:28 CET | Update | https://www.mdpi.com/2071-1050/9/4/506 |
| article html file updated | 24 September 2019 01:29 CEST | Update | - |
| article html file updated | 4 May 2019 04:33 CEST | Update | - |
| article html file updated | 28 April 2017 10:46 CEST | Update | - |
| article html file updated | 29 March 2017 17:20 CEST | Original file | - |
| article xml uploaded. | 29 March 2017 17:19 CEST | Original file | https://www.mdpi.com/2071-1050/9/4/506/xml |
| article pdf uploaded. | 29 March 2017 17:19 CEST | Version of Record | https://www.mdpi.com/2071-1050/9/4/506/pdf |
