| article html file updated | 6 February 2020 06:18 CET | Update | https://www.mdpi.com/2075-4426/3/4/306 |
| article html file updated | 7 May 2019 20:40 CEST | Update | - |
| article html file updated | 21 March 2019 09:44 CET | Update | - |
| article html file updated | 19 August 2015 14:16 CEST | Update | - |
| article html file updated | 21 July 2014 03:42 CEST | Original file | - |
| article xml file uploaded | 21 July 2014 03:42 CEST | Original file | https://www.mdpi.com/2075-4426/3/4/306/xml |
| article pdf uploaded. | 18 December 2013 14:29 CET | Version of Record | https://www.mdpi.com/2075-4426/3/4/306/pdf |
