| article html file updated | 7 February 2020 03:01 CET | Update | https://www.mdpi.com/2073-4352/6/1/7 |
| article html file updated | 6 May 2019 03:21 CEST | Update | - |
| article html file updated | 26 March 2019 17:43 CET | Original file | - |
| article pdf uploaded. | 4 January 2016 15:35 CET | Version of Record | https://www.mdpi.com/2073-4352/6/1/7/pdf |
| article xml uploaded. | 4 January 2016 15:35 CET | Original file | https://www.mdpi.com/2073-4352/6/1/7/xml |
