| article html file updated | 8 February 2020 03:50 CET | Update | https://www.mdpi.com/2073-8994/9/4/57 |
| article html file updated | 4 May 2019 01:44 CEST | Update | - |
| article html file updated | 28 April 2017 07:16 CEST | Update | - |
| article html file updated | 19 April 2017 14:01 CEST | Original file | - |
| article xml uploaded. | 19 April 2017 14:00 CEST | Original file | https://www.mdpi.com/2073-8994/9/4/57/xml |
| article pdf uploaded. | 19 April 2017 14:00 CEST | Updated version of record | https://www.mdpi.com/2073-8994/9/4/57/pdf |
| article pdf uploaded. | 18 April 2017 14:50 CEST | Version of Record | https://www.mdpi.com/2073-8994/9/4/57/pdf-vor |
