| article html file updated | 7 February 2020 09:56 CET | Update | https://www.mdpi.com/1996-1073/9/6/440 |
| article html file updated | 5 May 2019 13:24 CEST | Update | - |
| article html file updated | 27 March 2019 07:03 CET | Update | - |
| article html file updated | 28 June 2016 09:31 CEST | Update | - |
| article html file updated | 8 June 2016 11:02 CEST | Original file | - |
| article xml uploaded. | 8 June 2016 11:01 CEST | Original file | https://www.mdpi.com/1996-1073/9/6/440/xml |
| article pdf uploaded. | 8 June 2016 11:01 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/440/pdf |
