| article html file updated | 7 February 2020 00:35 CET | Update | https://www.mdpi.com/2227-9091/3/4/474 |
| article html file updated | 6 May 2019 07:43 CEST | Update | - |
| article html file updated | 26 March 2019 14:05 CET | Original file | - |
| article pdf uploaded. | 4 November 2015 16:43 CET | Version of Record | https://www.mdpi.com/2227-9091/3/4/474/pdf |
