| article html file updated | 7 February 2020 06:52 CET | Update | https://www.mdpi.com/1996-1073/9/4/273 |
| article html file updated | 5 May 2019 19:30 CEST | Update | - |
| article html file updated | 27 March 2019 01:06 CET | Update | - |
| article html file updated | 28 April 2016 07:55 CEST | Update | - |
| article html file updated | 6 April 2016 11:11 CEST | Original file | - |
| article xml uploaded. | 6 April 2016 11:09 CEST | Original file | https://www.mdpi.com/1996-1073/9/4/273/xml |
| article pdf uploaded. | 6 April 2016 11:09 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/4/273/pdf |
