| article html file updated | 7 February 2020 21:40 CET | Update | https://www.mdpi.com/2079-7737/6/1/4 |
| article html file updated | 22 September 2019 22:31 CEST | Update | - |
| article html file updated | 4 May 2019 14:45 CEST | Update | - |
| article html file updated | 30 March 2017 10:55 CEST | Update | - |
| article html file updated | 18 January 2017 09:04 CET | Original file | - |
| article xml uploaded. | 18 January 2017 09:03 CET | Update | https://www.mdpi.com/2079-7737/6/1/4/xml |
| article xml uploaded. | 18 January 2017 09:03 CET | Original file | - |
| article pdf uploaded. | 18 January 2017 09:03 CET | Version of Record | https://www.mdpi.com/2079-7737/6/1/4/pdf |
