| article html file updated | 8 February 2020 19:18 CET | Update | https://www.mdpi.com/2076-0817/6/4/52 |
| article html file updated | 27 September 2019 23:22 CEST | Update | N/A |
| article html file updated | 2 May 2019 19:21 CEST | Update | N/A |
| article html file updated | 2 January 2018 20:16 CET | Update | N/A |
| article html file updated | 24 October 2017 12:04 CEST | Original file | N/A |
| article xml uploaded. | 24 October 2017 12:02 CEST | Original file | https://www.mdpi.com/2076-0817/6/4/52/xml |
| article pdf uploaded. | 24 October 2017 12:02 CEST | Version of Record | https://www.mdpi.com/2076-0817/6/4/52/pdf |
