| article html file updated | 7 February 2020 21:18 CET | Update | https://www.mdpi.com/2076-0760/6/1/7 |
| article html file updated | 4 May 2019 15:41 CEST | Update | N/A |
| article html file updated | 12 January 2017 08:44 CET | Original file | N/A |
| article xml uploaded. | 12 January 2017 08:43 CET | Original file | https://www.mdpi.com/2076-0760/6/1/7/xml |
| article pdf uploaded. | 12 January 2017 08:43 CET | Version of Record | https://www.mdpi.com/2076-0760/6/1/7/pdf |
