| article html file updated | 11 February 2020 02:48 CET | Update | https://www.mdpi.com/2227-7099/6/4/68 |
| article html file updated | 27 April 2019 20:16 CEST | Update | - |
| article html file updated | 13 April 2019 16:07 CEST | Update | - |
| article html file updated | 2 April 2019 12:13 CEST | Update | - |
| article html file updated | 26 December 2018 05:53 CET | Update | - |
| article html file updated | 12 December 2018 12:50 CET | Original file | - |
| article pdf uploaded. | 12 December 2018 12:49 CET | Version of Record | https://www.mdpi.com/2227-7099/6/4/68/pdf |
| article xml uploaded. | 12 December 2018 12:49 CET | Update | https://www.mdpi.com/2227-7099/6/4/68/xml |
| article xml file uploaded | 12 December 2018 12:49 CET | Original file | - |
