| article html file updated | 11 February 2020 00:45 CET | Update | https://www.mdpi.com/2218-2004/6/4/68 |
| article html file updated | 28 April 2019 00:42 CEST | Update | - |
| article html file updated | 13 April 2019 20:37 CEST | Update | - |
| article html file updated | 2 April 2019 06:26 CEST | Update | - |
| article html file updated | 26 December 2018 22:49 CET | Update | - |
| article html file updated | 3 December 2018 08:47 CET | Original file | - |
| article pdf uploaded. | 3 December 2018 08:46 CET | Version of Record | https://www.mdpi.com/2218-2004/6/4/68/pdf |
| article xml uploaded. | 3 December 2018 08:46 CET | Update | https://www.mdpi.com/2218-2004/6/4/68/xml |
| article xml file uploaded | 3 December 2018 08:46 CET | Original file | - |
