| article html file updated | 6 February 2020 08:12 CET | Update | https://www.mdpi.com/2220-9964/3/2/408 |
| article html file updated | 7 May 2019 16:44 CEST | Update | - |
| article html file updated | 21 March 2019 14:35 CET | Update | - |
| article html file updated | 20 August 2015 01:15 CEST | Update | - |
| article html file updated | 10 November 2014 07:33 CET | Original file | - |
| article xml file uploaded | 10 November 2014 07:33 CET | Original file | https://www.mdpi.com/2220-9964/3/2/408/xml |
| article pdf uploaded. | 26 March 2014 13:46 CET | Version of Record | https://www.mdpi.com/2220-9964/3/2/408/pdf |
