| article html file updated | 7 February 2020 04:19 CET | Update | https://www.mdpi.com/2073-4352/6/2/20 |
| article html file updated | 6 May 2019 00:52 CEST | Update | - |
| article html file updated | 26 March 2019 20:13 CET | Original file | - |
| article pdf uploaded. | 5 February 2016 09:13 CET | Version of Record | https://www.mdpi.com/2073-4352/6/2/20/pdf |
| article xml uploaded. | 5 February 2016 09:13 CET | Original file | https://www.mdpi.com/2073-4352/6/2/20/xml |
