| article html file updated | 6 February 2020 04:37 CET | Update | https://www.mdpi.com/2077-0375/3/4/249 |
| article html file updated | 5 February 2020 07:41 CET | Update | - |
| article html file updated | 7 May 2019 23:55 CEST | Update | - |
| article html file updated | 21 March 2019 05:11 CET | Update | - |
| article html file updated | 17 June 2015 13:32 CEST | Update | - |
| article html file updated | 18 March 2014 09:52 CET | Update | - |
| article xml file uploaded | 18 March 2014 09:52 CET | Update | https://www.mdpi.com/2077-0375/3/4/249/xml |
| article html file updated | 14 March 2014 10:49 CET | Original file | - |
| article xml file uploaded | 14 March 2014 10:49 CET | Original file | - |
| article pdf uploaded. | 27 September 2013 15:18 CEST | Version of Record | https://www.mdpi.com/2077-0375/3/4/249/pdf |
