| article html file updated | 6 February 2020 00:26 CET | Update | https://www.mdpi.com/1424-8247/6/2/251 |
| article html file updated | 8 May 2019 08:43 CEST | Update | - |
| article html file updated | 20 March 2019 18:19 CET | Update | - |
| article html file updated | 17 June 2015 06:17 CEST | Update | - |
| article html file updated | 13 September 2013 17:17 CEST | Original file | - |
| article xml file uploaded | 13 September 2013 17:17 CEST | Original file | https://www.mdpi.com/1424-8247/6/2/251/xml |
| article pdf uploaded. | 8 February 2013 14:01 CET | Updated version of record | https://www.mdpi.com/1424-8247/6/2/251/pdf |
| article pdf uploaded. | 6 February 2013 11:12 CET | Version of Record | https://www.mdpi.com/1424-8247/6/2/251/pdf-vor |
