| article html file updated | 7 February 2020 03:56 CET | Update | https://www.mdpi.com/2075-4663/4/1/6 |
| article html file updated | 21 September 2019 10:25 CEST | Update | - |
| article html file updated | 6 May 2019 01:38 CEST | Update | - |
| article html file updated | 26 March 2019 19:26 CET | Update | - |
| article html file updated | 29 March 2016 11:11 CEST | Original file | - |
| article pdf uploaded. | 27 January 2016 11:00 CET | Version of Record | https://www.mdpi.com/2075-4663/4/1/6/pdf |
| article xml uploaded. | 27 January 2016 11:00 CET | Original file | https://www.mdpi.com/2075-4663/4/1/6/xml |
