| article html file updated | 6 February 2020 04:48 CET | Update | https://www.mdpi.com/2226-4787/1/2/153 |
| article html file updated | 7 May 2019 23:31 CEST | Update | - |
| article html file updated | 21 March 2019 05:41 CET | Update | - |
| article html file updated | 17 June 2015 13:45 CEST | Original file | - |
| article pdf uploaded. | 22 October 2013 18:20 CEST | Updated version of record | https://www.mdpi.com/2226-4787/1/2/153/pdf |
| article pdf uploaded. | 11 October 2013 14:21 CEST | Version of Record | https://www.mdpi.com/2226-4787/1/2/153/pdf-vor |
