| article html file updated | 6 February 2020 08:42 CET | Update | https://www.mdpi.com/2071-1050/6/4/2281 |
| article html file updated | 7 May 2019 15:40 CEST | Update | N/A |
| article html file updated | 21 March 2019 15:47 CET | Update | N/A |
| article html file updated | 20 August 2015 03:51 CEST | Update | N/A |
| article html file updated | 24 June 2014 12:27 CEST | Original file | N/A |
| article xml file uploaded | 24 June 2014 12:27 CEST | Original file | https://www.mdpi.com/2071-1050/6/4/2281/xml |
| article pdf uploaded. | 22 April 2014 17:07 CEST | Updated version of record | https://www.mdpi.com/2071-1050/6/4/2281/pdf |
| article pdf uploaded. | 21 April 2014 09:35 CEST | Version of Record | https://www.mdpi.com/2071-1050/6/4/2281/pdf-vor |
