| article html file updated | 7 February 2020 03:00 CET | Update | https://www.mdpi.com/2075-4701/6/1/9 |
| article html file updated | 6 May 2019 03:24 CEST | Update | - |
| article html file updated | 26 March 2019 17:40 CET | Original file | - |
| article pdf uploaded. | 4 January 2016 12:11 CET | Version of Record | https://www.mdpi.com/2075-4701/6/1/9/pdf |
| article xml uploaded. | 4 January 2016 12:11 CET | Original file | https://www.mdpi.com/2075-4701/6/1/9/xml |
