| article html file updated | 6 February 2020 22:55 CET | Update | https://www.mdpi.com/2076-0760/4/3/820 |
| article html file updated | 21 September 2019 03:37 CEST | Update | - |
| article html file updated | 6 May 2019 11:05 CEST | Update | - |
| article html file updated | 26 March 2019 10:59 CET | Original file | - |
| article pdf uploaded. | 17 September 2015 15:19 CEST | Version of Record | https://www.mdpi.com/2076-0760/4/3/820/pdf |
