| article html file updated | 7 February 2020 03:52 CET | Update | https://www.mdpi.com/2073-8994/8/2/7 |
| article html file updated | 6 May 2019 01:46 CEST | Update | - |
| article html file updated | 26 March 2019 19:19 CET | Original file | - |
| article pdf uploaded. | 26 January 2016 09:59 CET | Version of Record | https://www.mdpi.com/2073-8994/8/2/7/pdf |
| article xml uploaded. | 26 January 2016 09:59 CET | Original file | https://www.mdpi.com/2073-8994/8/2/7/xml |
