| article html file updated | 6 February 2020 12:56 CET | Update | https://www.mdpi.com/2304-8158/3/4/558 |
| article html file updated | 7 May 2019 06:54 CEST | Update | - |
| article html file updated | 22 March 2019 02:55 CET | Update | - |
| article html file updated | 16 February 2017 03:42 CET | Update | - |
| article html file updated | 20 August 2015 23:36 CEST | Original file | - |
| article pdf uploaded. | 17 October 2014 15:20 CEST | Version of Record | https://www.mdpi.com/2304-8158/3/4/558/pdf |
