| article html file updated | 8 February 2020 02:37 CET | Update | https://www.mdpi.com/1424-8220/17/4/720 |
| article html file updated | 24 September 2019 02:20 CEST | Update | - |
| article html file updated | 4 May 2019 04:14 CEST | Update | - |
| article html file updated | 29 April 2017 13:40 CEST | Update | - |
| article html file updated | 30 March 2017 13:53 CEST | Original file | - |
| article xml uploaded. | 30 March 2017 13:51 CEST | Update | https://www.mdpi.com/1424-8220/17/4/720/xml |
| article pdf uploaded. | 30 March 2017 13:51 CEST | Version of Record | https://www.mdpi.com/1424-8220/17/4/720/pdf |
