| article html file updated | 7 February 2020 20:47 CET | Update | https://www.mdpi.com/2075-1729/7/1/2 |
| article html file updated | 22 September 2019 17:54 CEST | Update | - |
| article html file updated | 4 May 2019 16:47 CEST | Update | - |
| article html file updated | 29 March 2017 07:45 CEST | Update | - |
| article html file updated | 4 January 2017 12:54 CET | Original file | - |
| article xml uploaded. | 4 January 2017 12:53 CET | Original file | https://www.mdpi.com/2075-1729/7/1/2/xml |
| article pdf uploaded. | 4 January 2017 12:53 CET | Version of Record | https://www.mdpi.com/2075-1729/7/1/2/pdf |
