| article html file updated | 6 February 2020 06:40 CET | Update | https://www.mdpi.com/2227-9040/2/1/13 |
| article html file updated | 7 May 2019 19:55 CEST | Update | - |
| article html file updated | 21 March 2019 10:52 CET | Update | - |
| article html file updated | 19 August 2015 17:02 CEST | Update | - |
| article html file updated | 24 June 2014 12:04 CEST | Original file | - |
| article xml file uploaded | 24 June 2014 12:04 CEST | Original file | https://www.mdpi.com/2227-9040/2/1/13/xml |
| article pdf uploaded. | 9 January 2014 16:09 CET | Version of Record | https://www.mdpi.com/2227-9040/2/1/13/pdf |
