| article html file updated | 29 August 2025 20:54 CEST | Update | https://www.mdpi.com/2077-0375/4/1/20 |
| article html file updated | 15 July 2022 22:48 CEST | Update | - |
| article html file updated | 6 February 2020 06:34 CET | Update | - |
| article html file updated | 7 May 2019 20:09 CEST | Update | - |
| article html file updated | 21 March 2019 10:33 CET | Update | - |
| article html file updated | 19 August 2015 16:30 CEST | Update | - |
| article html file updated | 28 April 2014 10:55 CEST | Original file | - |
| article xml file uploaded | 28 April 2014 10:55 CEST | Original file | https://www.mdpi.com/2077-0375/4/1/20/xml |
| article pdf uploaded. | 3 January 2014 13:51 CET | Version of Record | https://www.mdpi.com/2077-0375/4/1/20/pdf |
