| article xml uploaded. | 28 August 2019 00:05 CEST | Update | https://www.mdpi.com/1996-1073/7/3/1539/xml |
| article xml uploaded. | 27 August 2019 22:50 CEST | Update | - |
| article html file updated | 19 August 2015 23:43 CEST | Update | https://www.mdpi.com/1996-1073/7/3/1539 |
| article html file updated | 3 June 2014 12:12 CEST | Original file | - |
| article xml file uploaded | 3 June 2014 12:11 CEST | Original file | - |
| article pdf uploaded. | 13 March 2014 15:01 CET | Version of Record | https://www.mdpi.com/1996-1073/7/3/1539/pdf |
