| article html file updated | 5 February 2020 20:49 CET | Update | https://www.mdpi.com/1996-1073/5/6/1900 |
| article html file updated | 8 May 2019 17:16 CEST | Update | - |
| article html file updated | 25 March 2019 12:04 CET | Update | - |
| article html file updated | 19 July 2017 10:58 CEST | Update | - |
| article html file updated | 19 July 2017 10:57 CEST | Update | - |
| article html file updated | 19 July 2017 10:56 CEST | Original file | - |
| article xml uploaded. | 19 July 2017 10:54 CEST | Original file | https://www.mdpi.com/1996-1073/5/6/1900/xml |
