| article html file updated | 7 February 2020 21:10 CET | Update | https://www.mdpi.com/2076-3921/6/1/4 |
| article html file updated | 4 May 2019 15:57 CEST | Update | - |
| article html file updated | 29 March 2017 08:18 CEST | Update | - |
| article html file updated | 11 January 2017 14:07 CET | Original file | - |
| article xml uploaded. | 11 January 2017 14:06 CET | Original file | https://www.mdpi.com/2076-3921/6/1/4/xml |
| article pdf uploaded. | 11 January 2017 14:06 CET | Version of Record | https://www.mdpi.com/2076-3921/6/1/4/pdf |
