| article html file updated | 6 February 2020 11:28 CET | Update | https://www.mdpi.com/2227-9067/1/2/99 |
| article html file updated | 20 September 2019 11:40 CEST | Update | N/A |
| article html file updated | 7 May 2019 09:43 CEST | Update | N/A |
| article html file updated | 21 March 2019 23:06 CET | Update | N/A |
| article html file updated | 20 August 2015 15:29 CEST | Original file | N/A |
| article pdf uploaded. | 14 August 2014 14:36 CEST | Version of Record | https://www.mdpi.com/2227-9067/1/2/99/pdf |
