| article html file updated | 6 February 2020 02:24 CET | Update | https://www.mdpi.com/2218-1989/3/2/463 |
| article html file updated | 8 May 2019 04:33 CEST | Update | - |
| article html file updated | 20 March 2019 23:13 CET | Update | - |
| article html file updated | 17 June 2015 09:49 CEST | Update | - |
| article html file updated | 7 January 2014 12:29 CET | Original file | - |
| article xml file uploaded | 7 January 2014 12:29 CET | Original file | https://www.mdpi.com/2218-1989/3/2/463/xml |
| article pdf uploaded. | 31 May 2013 14:16 CEST | Updated version of record | https://www.mdpi.com/2218-1989/3/2/463/pdf |
| article pdf uploaded. | 30 May 2013 10:53 CEST | Version of Record | https://www.mdpi.com/2218-1989/3/2/463/pdf-vor |
