| article html file updated | 7 February 2020 03:20 CET | Update | https://www.mdpi.com/2218-1989/6/1/3 |
| article html file updated | 6 May 2019 02:46 CEST | Update | - |
| article html file updated | 26 March 2019 18:15 CET | Update | - |
| article html file updated | 30 March 2016 07:55 CEST | Original file | - |
| article pdf uploaded. | 12 January 2016 13:53 CET | Version of Record | https://www.mdpi.com/2218-1989/6/1/3/pdf |
| article xml uploaded. | 12 January 2016 13:53 CET | Original file | https://www.mdpi.com/2218-1989/6/1/3/xml |
