| article html file updated | 7 February 2020 21:02 CET | Update | https://www.mdpi.com/2076-0825/6/1/2 |
| article html file updated | 22 September 2019 19:20 CEST | Update | - |
| article html file updated | 4 May 2019 16:15 CEST | Update | - |
| article html file updated | 29 March 2017 10:32 CEST | Update | - |
| article html file updated | 12 January 2017 10:20 CET | Original file | - |
| article xml uploaded. | 12 January 2017 10:18 CET | Original file | https://www.mdpi.com/2076-0825/6/1/2/xml |
| article pdf uploaded. | 12 January 2017 10:18 CET | Updated version of record | https://www.mdpi.com/2076-0825/6/1/2/pdf |
| article pdf uploaded. | 8 January 2017 13:05 CET | Version of Record | https://www.mdpi.com/2076-0825/6/1/2/pdf-vor |
