| article html file updated | 7 February 2020 04:04 CET | Update | https://www.mdpi.com/2073-4433/7/2/20 |
| article html file updated | 6 May 2019 01:21 CEST | Update | - |
| article html file updated | 26 March 2019 19:43 CET | Original file | - |
| article pdf uploaded. | 29 January 2016 11:30 CET | Version of Record | https://www.mdpi.com/2073-4433/7/2/20/pdf |
| article xml uploaded. | 29 January 2016 11:30 CET | Original file | https://www.mdpi.com/2073-4433/7/2/20/xml |
