| article html file updated | 7 February 2020 09:29 CET | Update | https://www.mdpi.com/1996-1073/9/6/424 |
| article html file updated | 5 May 2019 14:16 CEST | Update | N/A |
| article html file updated | 27 March 2019 06:08 CET | Update | N/A |
| article html file updated | 28 June 2016 09:28 CEST | Update | N/A |
| article html file updated | 30 May 2016 11:05 CEST | Original file | N/A |
| article xml uploaded. | 30 May 2016 11:03 CEST | Original file | https://www.mdpi.com/1996-1073/9/6/424/xml |
| article pdf uploaded. | 30 May 2016 11:03 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/424/pdf |
