| article html file updated | 6 February 2020 01:25 CET | Update | https://www.mdpi.com/1996-1073/6/4/2031 |
| article html file updated | 8 May 2019 06:28 CEST | Update | N/A |
| article html file updated | 20 March 2019 20:46 CET | Update | N/A |
| article html file updated | 20 July 2017 11:28 CEST | Update | N/A |
| article html file updated | 20 July 2017 11:26 CEST | Update | N/A |
| article html file updated | 20 July 2017 11:26 CEST | Original file | N/A |
| article xml uploaded. | 20 July 2017 11:24 CEST | Update | https://www.mdpi.com/1996-1073/6/4/2031/xml |
| article pdf uploaded. | 12 April 2013 16:49 CEST | Updated version of record | https://www.mdpi.com/1996-1073/6/4/2031/pdf |
| article pdf uploaded. | 9 April 2013 10:00 CEST | Version of Record | https://www.mdpi.com/1996-1073/6/4/2031/pdf-vor |
