| article html file updated | 7 February 2020 02:27 CET | Update | https://www.mdpi.com/2077-1444/6/4/1433 |
| article html file updated | 6 May 2019 04:31 CEST | Update | N/A |
| article html file updated | 26 March 2019 16:51 CET | Original file | N/A |
| article pdf uploaded. | 19 December 2015 09:03 CET | Version of Record | https://www.mdpi.com/2077-1444/6/4/1433/pdf |
| article xml uploaded. | 19 December 2015 09:03 CET | Original file | https://www.mdpi.com/2077-1444/6/4/1433/xml |
