| article html file updated | 6 February 2020 06:43 CET | Update | https://www.mdpi.com/2073-4360/6/1/160 |
| article html file updated | 7 May 2019 19:51 CEST | Update | N/A |
| article html file updated | 21 March 2019 10:58 CET | Update | N/A |
| article html file updated | 19 August 2015 17:15 CEST | Original file | N/A |
| article pdf uploaded. | 13 January 2014 10:44 CET | Version of Record | https://www.mdpi.com/2073-4360/6/1/160/pdf |
