| article html file updated | 9 February 2020 06:06 CET | Update | https://www.mdpi.com/2227-7072/6/1/20 |
| article html file updated | 1 May 2019 19:37 CEST | Update | - |
| article html file updated | 17 April 2019 18:46 CEST | Update | - |
| article html file updated | 28 March 2019 22:13 CET | Update | - |
| article html file updated | 26 March 2018 15:43 CEST | Update | - |
| article html file updated | 9 February 2018 16:08 CET | Original file | - |
| article xml uploaded. | 9 February 2018 16:07 CET | Original file | https://www.mdpi.com/2227-7072/6/1/20/xml |
| article pdf uploaded. | 9 February 2018 16:07 CET | Version of Record | https://www.mdpi.com/2227-7072/6/1/20/pdf |
