| article html file updated | 7 February 2020 15:35 CET | Update | https://www.mdpi.com/2076-328X/6/4/20 |
| article html file updated | 22 September 2019 01:42 CEST | Update | - |
| article html file updated | 5 May 2019 03:01 CEST | Update | - |
| article html file updated | 29 December 2016 06:07 CET | Update | - |
| article html file updated | 27 September 2016 08:40 CEST | Original file | - |
| article xml uploaded. | 27 September 2016 08:39 CEST | Original file | https://www.mdpi.com/2076-328X/6/4/20/xml |
| article pdf uploaded. | 27 September 2016 08:39 CEST | Version of Record | https://www.mdpi.com/2076-328X/6/4/20/pdf |
