| article html file updated | 8 February 2020 02:59 CET | Update | https://www.mdpi.com/2073-4441/9/4/252 |
| article html file updated | 24 September 2019 04:25 CEST | Update | - |
| article html file updated | 4 May 2019 03:25 CEST | Update | - |
| article html file updated | 28 April 2017 11:22 CEST | Update | - |
| article html file updated | 5 April 2017 14:24 CEST | Original file | - |
| article xml uploaded. | 5 April 2017 14:23 CEST | Original file | https://www.mdpi.com/2073-4441/9/4/252/xml |
| article pdf uploaded. | 5 April 2017 14:23 CEST | Version of Record | https://www.mdpi.com/2073-4441/9/4/252/pdf |
