| article html file updated | 6 February 2020 09:39 CET | Update | https://www.mdpi.com/2218-1989/4/2/408 |
| article html file updated | 7 May 2019 13:46 CEST | Update | N/A |
| article html file updated | 21 March 2019 17:59 CET | Update | N/A |
| article html file updated | 20 August 2015 08:50 CEST | Update | N/A |
| article html file updated | 18 July 2014 03:57 CEST | Original file | N/A |
| article xml file uploaded | 18 July 2014 03:57 CEST | Original file | https://www.mdpi.com/2218-1989/4/2/408/xml |
| article supplementary file uploaded. | 30 May 2014 11:49 CEST | - | https://www.mdpi.com/2218-1989/4/2/408#supplementary |
| article pdf uploaded. | 30 May 2014 11:49 CEST | Version of Record | https://www.mdpi.com/2218-1989/4/2/408/pdf |
