| article html file updated | 8 February 2020 02:46 CET | Update | https://www.mdpi.com/2075-1680/6/2/8 |
| article html file updated | 24 September 2019 03:14 CEST | Update | - |
| article html file updated | 4 May 2019 03:53 CEST | Update | - |
| article html file updated | 30 June 2017 10:12 CEST | Update | - |
| article html file updated | 1 April 2017 11:30 CEST | Original file | - |
| article xml uploaded. | 1 April 2017 11:29 CEST | Original file | https://www.mdpi.com/2075-1680/6/2/8/xml |
| article pdf uploaded. | 1 April 2017 11:29 CEST | Version of Record | https://www.mdpi.com/2075-1680/6/2/8/pdf |
