| article html file updated | 7 February 2020 04:45 CET | Update | https://www.mdpi.com/2076-0760/5/1/9 |
| article html file updated | 5 May 2019 23:53 CEST | Update | - |
| article html file updated | 26 March 2019 21:08 CET | Original file | - |
| article xml uploaded. | 19 February 2016 14:49 CET | Original file | https://www.mdpi.com/2076-0760/5/1/9/xml |
| article pdf uploaded. | 19 February 2016 14:49 CET | Version of Record | https://www.mdpi.com/2076-0760/5/1/9/pdf |
