| article html file updated | 6 February 2020 05:00 CET | Update | https://www.mdpi.com/2223-7747/2/4/635 |
| article html file updated | 7 May 2019 23:06 CEST | Update | - |
| article html file updated | 21 March 2019 06:15 CET | Update | - |
| article html file updated | 17 June 2015 14:04 CEST | Update | - |
| article html file updated | 14 August 2014 12:04 CEST | Original file | - |
| article xml file uploaded | 14 August 2014 12:04 CEST | Original file | https://www.mdpi.com/2223-7747/2/4/635/xml |
| article pdf uploaded. | 18 October 2013 16:35 CEST | Version of Record | https://www.mdpi.com/2223-7747/2/4/635/pdf |
