| article html file updated | 6 February 2020 03:48 CET | Update | https://www.mdpi.com/1999-4915/5/8/1991 |
| article html file updated | 8 May 2019 01:42 CEST | Update | - |
| article html file updated | 21 March 2019 03:00 CET | Update | - |
| article html file updated | 17 June 2015 12:22 CEST | Update | - |
| article html file updated | 4 September 2013 09:38 CEST | Original file | - |
| article xml file uploaded | 4 September 2013 09:38 CEST | Original file | https://www.mdpi.com/1999-4915/5/8/1991/xml |
| article pdf uploaded. | 19 August 2013 08:38 CEST | Updated version of record | https://www.mdpi.com/1999-4915/5/8/1991/pdf |
| article pdf uploaded. | 15 August 2013 09:51 CEST | Version of Record | https://www.mdpi.com/1999-4915/5/8/1991/pdf-vor |
