| article html file updated | 7 February 2020 03:08 CET | Update | https://www.mdpi.com/2075-4698/6/1/2 |
| article html file updated | 21 September 2019 09:14 CEST | Update | - |
| article html file updated | 6 May 2019 03:08 CEST | Update | - |
| article html file updated | 26 March 2019 17:53 CET | Update | - |
| article html file updated | 19 April 2016 12:19 CEST | Original file | - |
| article pdf uploaded. | 6 January 2016 15:13 CET | Version of Record | https://www.mdpi.com/2075-4698/6/1/2/pdf |
| article xml uploaded. | 6 January 2016 15:13 CET | Original file | https://www.mdpi.com/2075-4698/6/1/2/xml |
