| article html file updated | 6 February 2020 09:25 CET | Update | https://www.mdpi.com/2226-4787/2/2/175 |
| article html file updated | 7 May 2019 14:14 CEST | Update | - |
| article html file updated | 21 March 2019 17:26 CET | Update | - |
| article html file updated | 20 August 2015 07:53 CEST | Original file | - |
| article pdf uploaded. | 23 May 2014 15:33 CEST | Updated version of record | https://www.mdpi.com/2226-4787/2/2/175/pdf |
| article pdf uploaded. | 22 May 2014 10:56 CEST | Version of Record | https://www.mdpi.com/2226-4787/2/2/175/pdf-vor |
