| article html file updated | 6 February 2020 18:05 CET | Update | https://www.mdpi.com/2223-7747/4/2/209 |
| article html file updated | 6 May 2019 21:06 CEST | Update | - |
| article html file updated | 26 March 2019 01:30 CET | Update | - |
| article html file updated | 12 October 2015 10:32 CEST | Update | - |
| article xml file uploaded | 12 October 2015 10:32 CEST | Original file | https://www.mdpi.com/2223-7747/4/2/209/xml |
| article html file updated | 21 August 2015 11:15 CEST | Original file | - |
| article pdf uploaded. | 27 April 2015 12:12 CEST | Version of Record | https://www.mdpi.com/2223-7747/4/2/209/pdf |
