| article html file updated | 6 February 2020 13:20 CET | Update | https://www.mdpi.com/2073-8994/6/4/909 |
| article html file updated | 7 May 2019 06:07 CEST | Update | N/A |
| article html file updated | 25 March 2019 16:58 CET | Update | N/A |
| article html file updated | 21 August 2015 01:03 CEST | Update | N/A |
| article html file updated | 31 December 2014 03:31 CET | Original file | N/A |
| article xml file uploaded | 31 December 2014 03:31 CET | Original file | https://www.mdpi.com/2073-8994/6/4/909/xml |
| article pdf uploaded. | 3 November 2014 13:35 CET | Version of Record | https://www.mdpi.com/2073-8994/6/4/909/pdf |
