| article html file updated | 6 February 2020 09:19 CET | Update | https://www.mdpi.com/2227-9075/1/2/65 |
| article html file updated | 7 May 2019 14:25 CEST | Update | N/A |
| article html file updated | 21 March 2019 17:12 CET | Update | N/A |
| article html file updated | 20 August 2015 07:20 CEST | Original file | N/A |
| article pdf uploaded. | 16 May 2014 15:38 CEST | Version of Record | https://www.mdpi.com/2227-9075/1/2/65/pdf |
