| article html file updated | 7 February 2020 22:00 CET | Update | https://www.mdpi.com/2076-0787/6/1/2 |
| article html file updated | 4 May 2019 14:00 CEST | Update | - |
| article html file updated | 23 January 2017 05:15 CET | Update | - |
| article xml uploaded. | 23 January 2017 05:14 CET | Update | https://www.mdpi.com/2076-0787/6/1/2/xml |
| article pdf uploaded. | 23 January 2017 05:14 CET | Updated version of record | https://www.mdpi.com/2076-0787/6/1/2/pdf |
| article html file updated | 22 January 2017 12:29 CET | Original file | - |
| article xml uploaded. | 22 January 2017 12:28 CET | Original file | - |
| article pdf uploaded. | 22 January 2017 12:28 CET | Version of Record | https://www.mdpi.com/2076-0787/6/1/2/pdf-vor |
