| article html file updated | 6 February 2020 16:54 CET | Update | https://www.mdpi.com/2076-0760/4/1/239 |
| article html file updated | 6 May 2019 23:15 CEST | Update | N/A |
| article html file updated | 25 March 2019 23:26 CET | Update | N/A |
| article html file updated | 14 February 2017 12:14 CET | Original file | N/A |
| article pdf uploaded. | 23 March 2015 15:42 CET | Version of Record | https://www.mdpi.com/2076-0760/4/1/239/pdf |
