| article html file updated | 6 February 2020 12:18 CET | Update | https://www.mdpi.com/2075-5309/4/3/520 |
| article html file updated | 22 March 2019 01:04 CET | Update | - |
| article html file updated | 20 August 2015 19:52 CEST | Original file | - |
| article pdf uploaded. | 18 September 2014 14:53 CEST | Version of Record | https://www.mdpi.com/2075-5309/4/3/520/pdf |
