| article html file updated | 6 February 2020 12:32 CET | Update | https://www.mdpi.com/2072-6694/6/4/1821 |
| article html file updated | 22 March 2019 01:43 CET | Update | - |
| article html file updated | 20 August 2015 21:25 CEST | Update | - |
| article html file updated | 26 December 2014 11:27 CET | Original file | - |
| article xml file uploaded | 26 December 2014 11:27 CET | Original file | https://www.mdpi.com/2072-6694/6/4/1821/xml |
| article pdf uploaded. | 29 September 2014 10:32 CEST | Version of Record | https://www.mdpi.com/2072-6694/6/4/1821/pdf |
