| article html file updated | 6 February 2020 14:10 CET | Update | https://www.mdpi.com/2073-8994/6/4/997 |
| article html file updated | 7 May 2019 04:31 CEST | Update | - |
| article html file updated | 25 March 2019 18:46 CET | Update | - |
| article html file updated | 21 August 2015 03:22 CEST | Update | - |
| article html file updated | 31 December 2014 03:31 CET | Original file | - |
| article xml file uploaded | 31 December 2014 03:31 CET | Original file | https://www.mdpi.com/2073-8994/6/4/997/xml |
| article pdf uploaded. | 3 December 2014 14:46 CET | Version of Record | https://www.mdpi.com/2073-8994/6/4/997/pdf |
