| article html file updated | 7 February 2020 03:50 CET | Update | https://www.mdpi.com/1996-1944/9/2/69 |
| article html file updated | 6 May 2019 01:49 CEST | Update | N/A |
| article html file updated | 26 March 2019 19:14 CET | Original file | N/A |
| article pdf uploaded. | 25 January 2016 08:58 CET | Version of Record | https://www.mdpi.com/1996-1944/9/2/69/pdf |
| article xml uploaded. | 25 January 2016 08:58 CET | Original file | https://www.mdpi.com/1996-1944/9/2/69/xml |
