| article html file updated | 8 February 2020 04:15 CET | Update | https://www.mdpi.com/2072-6643/9/4/421 |
| article html file updated | 24 September 2019 11:35 CEST | Update | - |
| article html file updated | 4 May 2019 00:59 CEST | Update | - |
| article html file updated | 28 April 2017 11:54 CEST | Update | - |
| article html file updated | 24 April 2017 12:11 CEST | Original file | - |
| article xml uploaded. | 24 April 2017 12:09 CEST | Update | https://www.mdpi.com/2072-6643/9/4/421/xml |
| article pdf uploaded. | 24 April 2017 12:09 CEST | Version of Record | https://www.mdpi.com/2072-6643/9/4/421/pdf |
