| article html file updated | 6 February 2020 07:35 CET | Update | https://www.mdpi.com/2077-0375/4/1/81 |
| article html file updated | 7 May 2019 17:59 CEST | Update | - |
| article html file updated | 21 March 2019 13:06 CET | Update | - |
| article html file updated | 19 August 2015 21:59 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/2077-0375/4/1/81/xml |
| article pdf uploaded. | 27 February 2014 13:41 CET | Version of Record | https://www.mdpi.com/2077-0375/4/1/81/pdf |
