| article html file updated | 6 February 2020 05:45 CET | Update | https://www.mdpi.com/1999-4893/6/4/857 |
| article html file updated | 7 May 2019 21:42 CEST | Update | - |
| article html file updated | 21 March 2019 08:13 CET | Update | - |
| article html file updated | 25 July 2017 05:04 CEST | Original file | - |
| article xml uploaded. | 25 July 2017 05:03 CEST | Original file | https://www.mdpi.com/1999-4893/6/4/857/xml |
| article pdf uploaded. | 25 November 2013 16:53 CET | Version of Record | https://www.mdpi.com/1999-4893/6/4/857/pdf |
