| article html file updated | 6 February 2020 07:28 CET | Update | https://www.mdpi.com/2077-0375/4/1/55 |
| article html file updated | 7 May 2019 18:13 CEST | Update | - |
| article html file updated | 21 March 2019 12:51 CET | Update | - |
| article html file updated | 19 August 2015 21:30 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/2077-0375/4/1/55/xml |
| article pdf uploaded. | 24 February 2014 11:32 CET | Version of Record | https://www.mdpi.com/2077-0375/4/1/55/pdf |
