| article html file updated | 6 February 2020 04:42 CET | Update | https://www.mdpi.com/1999-4893/6/4/618 |
| article html file updated | 7 May 2019 23:44 CEST | Update | - |
| article html file updated | 21 March 2019 05:26 CET | Update | - |
| article html file updated | 24 July 2017 05:38 CEST | Update | - |
| article html file updated | 24 July 2017 05:36 CEST | Update | - |
| article html file updated | 24 July 2017 05:36 CEST | Original file | - |
| article xml uploaded. | 24 July 2017 05:35 CEST | Original file | https://www.mdpi.com/1999-4893/6/4/618/xml |
| article pdf uploaded. | 3 October 2013 13:32 CEST | Version of Record | https://www.mdpi.com/1999-4893/6/4/618/pdf |
