| article html file updated | 6 February 2020 16:56 CET | Update | https://www.mdpi.com/2079-7737/4/2/251 |
| article html file updated | 6 May 2019 23:11 CEST | Update | - |
| article html file updated | 25 March 2019 23:30 CET | Update | - |
| article html file updated | 21 August 2015 09:15 CEST | Update | - |
| article html file updated | 7 July 2015 10:59 CEST | Original file | - |
| article xml file uploaded | 7 July 2015 10:59 CEST | Original file | https://www.mdpi.com/2079-7737/4/2/251/xml |
| article pdf uploaded. | 24 March 2015 15:52 CET | Version of Record | https://www.mdpi.com/2079-7737/4/2/251/pdf |
