| article html file updated | 6 February 2020 17:14 CET | Update | https://www.mdpi.com/2076-0760/4/2/260 |
| article html file updated | 20 September 2019 19:35 CEST | Update | N/A |
| article html file updated | 6 May 2019 22:42 CEST | Update | N/A |
| article html file updated | 25 March 2019 23:59 CET | Update | N/A |
| article html file updated | 14 February 2017 12:14 CET | Original file | N/A |
| article pdf uploaded. | 1 April 2015 17:05 CEST | Version of Record | https://www.mdpi.com/2076-0760/4/2/260/pdf |
