| article html file updated | 6 February 2020 16:37 CET | Update | https://www.mdpi.com/2076-0760/4/1/219 |
| article html file updated | 20 September 2019 18:50 CEST | Update | N/A |
| article html file updated | 6 May 2019 23:47 CEST | Update | N/A |
| article html file updated | 25 March 2019 22:56 CET | Original file | N/A |
| article pdf uploaded. | 13 March 2015 13:15 CET | Version of Record | https://www.mdpi.com/2076-0760/4/1/219/pdf |
