| article html file updated | 8 February 2020 00:11 CET | Update | https://www.mdpi.com/2076-0787/6/1/4 |
| article html file updated | 4 May 2019 09:36 CEST | Update | N/A |
| article html file updated | 24 February 2017 11:42 CET | Update | N/A |
| article html file updated | 24 February 2017 11:42 CET | Update | N/A |
| article html file updated | 24 February 2017 11:42 CET | Original file | N/A |
| article xml uploaded. | 24 February 2017 11:41 CET | Original file | https://www.mdpi.com/2076-0787/6/1/4/xml |
| article pdf uploaded. | 24 February 2017 11:41 CET | Version of Record | https://www.mdpi.com/2076-0787/6/1/4/pdf |
