| article html file updated | 6 February 2020 11:20 CET | Update | https://www.mdpi.com/2077-0375/4/3/447 |
| article html file updated | 7 May 2019 10:03 CEST | Update | - |
| article html file updated | 21 March 2019 22:43 CET | Update | - |
| article html file updated | 20 August 2015 14:51 CEST | Update | - |
| article html file updated | 14 October 2014 06:28 CEST | Original file | - |
| article xml file uploaded | 14 October 2014 06:28 CEST | Original file | https://www.mdpi.com/2077-0375/4/3/447/xml |
| article pdf uploaded. | 8 August 2014 15:27 CEST | Version of Record | https://www.mdpi.com/2077-0375/4/3/447/pdf |
