| article html file updated | 7 February 2020 21:35 CET | Update | https://www.mdpi.com/2220-9964/6/1/20 |
| article html file updated | 22 September 2019 22:06 CEST | Update | - |
| article html file updated | 4 May 2019 14:57 CEST | Update | - |
| article html file updated | 8 February 2017 09:01 CET | Update | - |
| article html file updated | 17 January 2017 08:43 CET | Original file | - |
| article xml uploaded. | 17 January 2017 08:41 CET | Update | https://www.mdpi.com/2220-9964/6/1/20/xml |
| article xml uploaded. | 17 January 2017 08:41 CET | Original file | - |
| article pdf uploaded. | 17 January 2017 08:41 CET | Version of Record | https://www.mdpi.com/2220-9964/6/1/20/pdf |
