| article html file updated | 6 February 2020 07:31 CET | Update | https://www.mdpi.com/2218-1989/4/1/129 |
| article html file updated | 7 May 2019 18:07 CEST | Update | - |
| article html file updated | 21 March 2019 12:58 CET | Update | - |
| article html file updated | 19 August 2015 21:45 CEST | Update | - |
| article html file updated | 12 May 2014 15:29 CEST | Original file | - |
| article xml file uploaded | 12 May 2014 15:29 CEST | Original file | https://www.mdpi.com/2218-1989/4/1/129/xml |
| article pdf uploaded. | 26 February 2014 09:30 CET | Version of Record | https://www.mdpi.com/2218-1989/4/1/129/pdf |
