| article html file updated | 6 February 2020 06:37 CET | Update | https://www.mdpi.com/2071-1050/6/1/306 |
| article html file updated | 7 May 2019 20:02 CEST | Update | N/A |
| article html file updated | 21 March 2019 10:43 CET | Update | N/A |
| article html file updated | 19 August 2015 16:47 CEST | Original file | N/A |
| article pdf uploaded. | 7 January 2014 14:48 CET | Version of Record | https://www.mdpi.com/2071-1050/6/1/306/pdf |
