| article html file updated | 6 February 2020 07:42 CET | Update | https://www.mdpi.com/2073-4360/6/3/613 |
| article html file updated | 7 May 2019 17:43 CEST | Update | N/A |
| article html file updated | 21 March 2019 13:25 CET | Update | N/A |
| article html file updated | 19 August 2015 22:43 CEST | Original file | N/A |
| article pdf uploaded. | 5 March 2014 14:14 CET | Version of Record | https://www.mdpi.com/2073-4360/6/3/613/pdf |
