| article html file updated | 7 February 2020 07:27 CET | Update | https://www.mdpi.com/1996-1073/9/4/297 |
| article html file updated | 5 May 2019 18:16 CEST | Update | - |
| article html file updated | 27 March 2019 02:14 CET | Update | - |
| article html file updated | 28 April 2016 08:02 CEST | Update | - |
| article html file updated | 19 April 2016 08:49 CEST | Original file | - |
| article xml uploaded. | 19 April 2016 08:48 CEST | Original file | https://www.mdpi.com/1996-1073/9/4/297/xml |
| article pdf uploaded. | 19 April 2016 08:48 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/4/297/pdf |
