| article html file updated | 6 February 2020 00:58 CET | Update | https://www.mdpi.com/1999-4907/4/1/137 |
| article html file updated | 8 May 2019 07:25 CEST | Update | - |
| article html file updated | 20 March 2019 19:44 CET | Update | - |
| article html file updated | 17 June 2015 07:26 CEST | Update | - |
| article html file updated | 10 November 2014 07:32 CET | Original file | - |
| article xml file uploaded | 10 November 2014 07:32 CET | Original file | https://www.mdpi.com/1999-4907/4/1/137/xml |
| article pdf uploaded. | 12 March 2013 15:48 CET | Version of Record | https://www.mdpi.com/1999-4907/4/1/137/pdf |
