| article html file updated | 6 February 2020 05:18 CET | Update | https://www.mdpi.com/1999-4893/6/4/726 |
| article html file updated | 7 May 2019 22:35 CEST | Update | N/A |
| article html file updated | 21 March 2019 07:00 CET | Update | N/A |
| article html file updated | 2 August 2017 05:11 CEST | Original file | N/A |
| article xml uploaded. | 2 August 2017 04:20 CEST | Original file | https://www.mdpi.com/1999-4893/6/4/726/xml |
| article pdf uploaded. | 6 November 2013 17:10 CET | Updated version of record | https://www.mdpi.com/1999-4893/6/4/726/pdf |
| article pdf uploaded. | 5 November 2013 14:11 CET | Updated version of record | https://www.mdpi.com/1999-4893/6/4/726/pdf-vor |
| article pdf uploaded. | 1 November 2013 11:23 CET | Version of Record | https://www.mdpi.com/1999-4893/6/4/726/pdf-vor |
