| article html file updated | 8 February 2020 04:06 CET | Update | https://www.mdpi.com/1424-8220/17/4/921 |
| article html file updated | 24 September 2019 10:46 CEST | Update | - |
| article html file updated | 4 May 2019 01:14 CEST | Update | - |
| article html file updated | 29 April 2017 14:28 CEST | Update | - |
| article html file updated | 21 April 2017 16:25 CEST | Original file | - |
| article xml uploaded. | 21 April 2017 16:24 CEST | Original file | https://www.mdpi.com/1424-8220/17/4/921/xml |
| article pdf uploaded. | 21 April 2017 16:24 CEST | Version of Record | https://www.mdpi.com/1424-8220/17/4/921/pdf |
