| article html file updated | 6 February 2020 08:40 CET | Update | https://www.mdpi.com/2304-8158/3/2/217 |
| article html file updated | 7 May 2019 15:45 CEST | Update | - |
| article html file updated | 21 March 2019 15:41 CET | Update | - |
| article html file updated | 16 February 2017 03:39 CET | Update | - |
| article html file updated | 20 August 2015 03:37 CEST | Original file | - |
| article pdf uploaded. | 17 April 2014 10:39 CEST | Version of Record | https://www.mdpi.com/2304-8158/3/2/217/pdf |
