| article html file updated | 6 February 2020 13:05 CET | Update | https://www.mdpi.com/1999-4893/7/4/554 |
| article html file updated | 7 May 2019 06:36 CEST | Update | - |
| article html file updated | 25 March 2019 16:27 CET | Update | - |
| article html file updated | 31 July 2017 04:24 CEST | Original file | - |
| article xml uploaded. | 31 July 2017 04:23 CEST | Original file | https://www.mdpi.com/1999-4893/7/4/554/xml |
| article pdf uploaded. | 23 October 2014 16:58 CEST | Version of Record | https://www.mdpi.com/1999-4893/7/4/554/pdf |
