| article html file updated | 7 February 2020 22:18 CET | Update | https://www.mdpi.com/2076-3921/6/1/8 |
| article html file updated | 23 September 2019 02:00 CEST | Update | - |
| article html file updated | 4 May 2019 13:26 CEST | Update | - |
| article html file updated | 29 March 2017 08:18 CEST | Update | - |
| article html file updated | 26 January 2017 11:50 CET | Original file | - |
| article xml uploaded. | 26 January 2017 11:49 CET | Original file | https://www.mdpi.com/2076-3921/6/1/8/xml |
| article pdf uploaded. | 26 January 2017 11:49 CET | Version of Record | https://www.mdpi.com/2076-3921/6/1/8/pdf |
