| article html file updated | 6 February 2020 07:02 CET | Update | https://www.mdpi.com/2073-4441/6/2/301 |
| article html file updated | 7 May 2019 19:07 CEST | Update | - |
| article html file updated | 21 March 2019 11:47 CET | Update | - |
| article html file updated | 19 August 2015 19:17 CEST | Update | - |
| article html file updated | 24 June 2014 12:28 CEST | Original file | - |
| article xml file uploaded | 24 June 2014 12:28 CEST | Original file | https://www.mdpi.com/2073-4441/6/2/301/xml |
| article pdf uploaded. | 28 January 2014 14:31 CET | Version of Record | https://www.mdpi.com/2073-4441/6/2/301/pdf |
