| article html file updated | 6 February 2020 23:35 CET | Update | https://www.mdpi.com/2227-7072/3/4/451 |
| article html file updated | 21 September 2019 04:32 CEST | Update | - |
| article html file updated | 6 May 2019 09:44 CEST | Update | - |
| article html file updated | 26 March 2019 12:12 CET | Update | - |
| article html file updated | 16 October 2015 13:11 CEST | Original file | - |
| article xml file uploaded | 16 October 2015 13:11 CEST | Original file | https://www.mdpi.com/2227-7072/3/4/451/xml |
| article pdf uploaded. | 9 October 2015 16:12 CEST | Version of Record | https://www.mdpi.com/2227-7072/3/4/451/pdf |
