| article html file updated | 6 February 2020 06:34 CET | Update | https://www.mdpi.com/1999-4907/5/1/21 |
| article html file updated | 7 May 2019 20:08 CEST | Update | - |
| article html file updated | 21 March 2019 10:34 CET | Update | - |
| article html file updated | 19 August 2015 16:31 CEST | Update | - |
| article html file updated | 14 August 2014 11:41 CEST | Update | - |
| article xml file uploaded | 14 August 2014 11:41 CEST | Update | https://www.mdpi.com/1999-4907/5/1/21/xml |
| article html file updated | 14 August 2014 11:21 CEST | Original file | - |
| article xml file uploaded | 14 August 2014 11:21 CEST | Original file | - |
| article pdf uploaded. | 6 January 2014 10:24 CET | Updated version of record | https://www.mdpi.com/1999-4907/5/1/21/pdf |
| article pdf uploaded. | 3 January 2014 14:59 CET | Version of Record | https://www.mdpi.com/1999-4907/5/1/21/pdf-vor |
