| article html file updated | 6 February 2020 09:24 CET | Update | https://www.mdpi.com/2077-0472/4/2/159 |
| article html file updated | 21 March 2019 17:24 CET | Update | - |
| article html file updated | 20 August 2015 07:52 CEST | Update | - |
| article html file updated | 20 October 2014 11:29 CEST | Original file | - |
| article xml file uploaded | 20 October 2014 11:29 CEST | Original file | https://www.mdpi.com/2077-0472/4/2/159/xml |
| article pdf uploaded. | 22 May 2014 10:30 CEST | Version of Record | https://www.mdpi.com/2077-0472/4/2/159/pdf |
