| article html file updated | 6 February 2020 01:33 CET | Update | https://www.mdpi.com/2218-1989/3/2/277 |
| article html file updated | 8 May 2019 06:12 CEST | Update | - |
| article html file updated | 20 March 2019 21:06 CET | Update | - |
| article html file updated | 17 June 2015 08:30 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/2218-1989/3/2/277/xml |
| article pdf uploaded. | 16 April 2013 14:22 CEST | Version of Record | https://www.mdpi.com/2218-1989/3/2/277/pdf |
