| article html file updated | 7 February 2020 07:03 CET | Update | https://www.mdpi.com/1996-1073/9/4/277 |
| article html file updated | 5 May 2019 19:05 CEST | Update | - |
| article html file updated | 27 March 2019 01:27 CET | Update | - |
| article html file updated | 28 April 2016 07:56 CEST | Update | - |
| article html file updated | 9 April 2016 07:26 CEST | Original file | - |
| article xml uploaded. | 9 April 2016 07:24 CEST | Original file | https://www.mdpi.com/1996-1073/9/4/277/xml |
| article pdf uploaded. | 9 April 2016 07:24 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/4/277/pdf |
