| article html file updated | 8 February 2020 20:57 CET | Update | https://www.mdpi.com/2076-0760/6/4/139 |
| article html file updated | 28 September 2019 09:58 CEST | Update | - |
| article html file updated | 2 May 2019 15:31 CEST | Update | - |
| article html file updated | 13 November 2017 03:04 CET | Original file | - |
| article xml uploaded. | 13 November 2017 03:02 CET | Original file | https://www.mdpi.com/2076-0760/6/4/139/xml |
| article pdf uploaded. | 13 November 2017 03:02 CET | Updated version of record | https://www.mdpi.com/2076-0760/6/4/139/pdf |
| article pdf uploaded. | 11 November 2017 12:15 CET | Version of Record | https://www.mdpi.com/2076-0760/6/4/139/pdf-vor |
