| article html file updated | 7 February 2020 03:37 CET | Update | https://www.mdpi.com/1424-8220/16/1/56 |
| article html file updated | 6 May 2019 02:12 CEST | Update | N/A |
| article html file updated | 26 March 2019 18:51 CET | Original file | N/A |
| article pdf uploaded. | 21 January 2016 13:54 CET | Updated version of record | https://www.mdpi.com/1424-8220/16/1/56/pdf |
| article pdf uploaded. | 20 January 2016 08:36 CET | Version of Record | https://www.mdpi.com/1424-8220/16/1/56/pdf-vor |
| article xml uploaded. | 20 January 2016 08:36 CET | Original file | https://www.mdpi.com/1424-8220/16/1/56/xml |
