| article html file updated | 6 February 2020 04:42 CET | Update | https://www.mdpi.com/1911-8074/6/1/4 |
| article html file updated | 20 September 2019 01:39 CEST | Update | - |
| article html file updated | 7 May 2019 23:44 CEST | Update | - |
| article html file updated | 21 March 2019 05:26 CET | Update | - |
| article html file updated | 17 June 2015 13:38 CEST | Update | - |
| article html file updated | 14 November 2014 11:01 CET | Original file | - |
| article xml file uploaded | 14 November 2014 11:01 CET | Original file | https://www.mdpi.com/1911-8074/6/1/4/xml |
| article pdf uploaded. | 3 October 2013 16:06 CEST | Updated version of record | https://www.mdpi.com/1911-8074/6/1/4/pdf |
| article pdf uploaded. | 3 October 2013 14:13 CEST | Updated version of record | https://www.mdpi.com/1911-8074/6/1/4/pdf-vor |
| article pdf uploaded. | 3 October 2013 10:55 CEST | Version of Record | https://www.mdpi.com/1911-8074/6/1/4/pdf-vor |
