| article html file updated | 6 February 2020 13:18 CET | Update | https://www.mdpi.com/2075-1702/2/4/233 |
| article html file updated | 7 May 2019 06:11 CEST | Update | N/A |
| article html file updated | 25 March 2019 16:54 CET | Update | N/A |
| article html file updated | 21 August 2015 00:57 CEST | Original file | N/A |
| article pdf uploaded. | 3 November 2014 08:00 CET | Updated version of record | https://www.mdpi.com/2075-1702/2/4/233/pdf |
| article pdf uploaded. | 3 November 2014 07:58 CET | Updated version of record | https://www.mdpi.com/2075-1702/2/4/233/pdf-vor |
| article pdf uploaded. | 31 October 2014 13:32 CET | Version of Record | https://www.mdpi.com/2075-1702/2/4/233/pdf-vor |
