| article html file updated | 7 February 2020 07:10 CET | Update | https://www.mdpi.com/1420-3049/21/4/420 |
| article html file updated | 21 September 2019 15:00 CEST | Update | - |
| article html file updated | 5 May 2019 18:51 CEST | Update | - |
| article html file updated | 27 March 2019 01:41 CET | Update | - |
| article html file updated | 17 September 2018 03:43 CEST | Update | - |
| article html file updated | 28 April 2016 11:30 CEST | Update | - |
| article html file updated | 12 April 2016 13:26 CEST | Original file | - |
| article xml uploaded. | 12 April 2016 13:25 CEST | Update | https://www.mdpi.com/1420-3049/21/4/420/xml |
| article pdf uploaded. | 12 April 2016 13:25 CEST | Version of Record | https://www.mdpi.com/1420-3049/21/4/420/pdf |
