| article html file updated | 6 February 2020 19:33 CET | Update | https://www.mdpi.com/2076-0760/4/2/434 |
| article html file updated | 20 September 2019 22:37 CEST | Update | N/A |
| article html file updated | 6 May 2019 18:04 CEST | Update | N/A |
| article html file updated | 26 March 2019 04:29 CET | Original file | N/A |
| article pdf uploaded. | 10 June 2015 10:42 CEST | Version of Record | https://www.mdpi.com/2076-0760/4/2/434/pdf |
