| article html file updated | 7 February 2020 04:34 CET | Update | https://www.mdpi.com/2075-1702/4/1/6 |
| article html file updated | 6 May 2019 00:20 CEST | Update | N/A |
| article html file updated | 26 March 2019 20:44 CET | Original file | N/A |
| article pdf uploaded. | 15 February 2016 11:29 CET | Version of Record | https://www.mdpi.com/2075-1702/4/1/6/pdf |
| article xml uploaded. | 15 February 2016 11:29 CET | Original file | https://www.mdpi.com/2075-1702/4/1/6/xml |
