| article html file updated | 7 February 2020 03:19 CET | Update | https://www.mdpi.com/1999-4907/7/1/20 |
| article html file updated | 6 May 2019 02:48 CEST | Update | - |
| article html file updated | 26 March 2019 18:13 CET | Original file | - |
| article pdf uploaded. | 12 January 2016 12:22 CET | Version of Record | https://www.mdpi.com/1999-4907/7/1/20/pdf |
| article xml uploaded. | 12 January 2016 12:22 CET | Original file | https://www.mdpi.com/1999-4907/7/1/20/xml |
