| article html file updated | 6 February 2020 02:36 CET | Update | https://www.mdpi.com/2218-1989/3/2/506 |
| article html file updated | 8 May 2019 04:07 CEST | Update | - |
| article html file updated | 20 March 2019 23:44 CET | Update | - |
| article html file updated | 17 June 2015 10:11 CEST | Update | - |
| article html file updated | 7 January 2014 12:30 CET | Original file | - |
| article xml file uploaded | 7 January 2014 12:30 CET | Original file | https://www.mdpi.com/2218-1989/3/2/506/xml |
| article pdf uploaded. | 13 June 2013 13:52 CEST | Updated version of record | https://www.mdpi.com/2218-1989/3/2/506/pdf |
| article pdf uploaded. | 13 June 2013 10:36 CEST | Version of Record | https://www.mdpi.com/2218-1989/3/2/506/pdf-vor |
