| article html file updated | 6 February 2020 06:29 CET | Update | https://www.mdpi.com/2077-0375/4/1/1 |
| article html file updated | 7 May 2019 20:17 CEST | Update | - |
| article html file updated | 21 March 2019 10:18 CET | Update | - |
| article html file updated | 19 August 2015 15:58 CEST | Update | - |
| article html file updated | 28 April 2014 10:55 CEST | Update | - |
| article xml file uploaded | 28 April 2014 10:55 CEST | Update | https://www.mdpi.com/2077-0375/4/1/1/xml |
| article html file updated | 2 April 2014 08:47 CEST | Original file | - |
| article xml file uploaded | 2 April 2014 08:47 CEST | Original file | - |
| article pdf uploaded. | 30 December 2013 15:32 CET | Version of Record | https://www.mdpi.com/2077-0375/4/1/1/pdf |
