| article html file updated | 6 February 2020 06:18 CET | Update | https://www.mdpi.com/2079-7737/2/4/1488 |
| article html file updated | 7 May 2019 20:39 CEST | Update | - |
| article html file updated | 21 March 2019 09:45 CET | Update | - |
| article html file updated | 19 August 2015 14:16 CEST | Update | - |
| article html file updated | 28 April 2014 10:27 CEST | Original file | - |
| article xml file uploaded | 28 April 2014 10:27 CEST | Original file | https://www.mdpi.com/2079-7737/2/4/1488/xml |
| article pdf uploaded. | 18 December 2013 15:01 CET | Version of Record | https://www.mdpi.com/2079-7737/2/4/1488/pdf |
