| article html file updated | 7 February 2020 02:43 CET | Update | https://www.mdpi.com/1424-8220/16/1/20 |
| article html file updated | 6 May 2019 03:55 CEST | Update | - |
| article html file updated | 26 March 2019 17:17 CET | Original file | - |
| article pdf uploaded. | 25 January 2016 15:02 CET | Updated version of record | https://www.mdpi.com/1424-8220/16/1/20/pdf |
| article pdf uploaded. | 25 January 2016 15:00 CET | Updated version of record | https://www.mdpi.com/1424-8220/16/1/20/pdf-vor |
| article pdf uploaded. | 25 December 2015 09:24 CET | Version of Record | https://www.mdpi.com/1424-8220/16/1/20/pdf-vor |
| article xml uploaded. | 25 December 2015 09:24 CET | Original file | https://www.mdpi.com/1424-8220/16/1/20/xml |
