| article html file updated | 6 February 2020 12:39 CET | Update | https://www.mdpi.com/2076-0760/3/4/672 |
| article html file updated | 20 September 2019 13:31 CEST | Update | - |
| article html file updated | 7 May 2019 07:28 CEST | Update | - |
| article html file updated | 22 March 2019 02:04 CET | Update | - |
| article html file updated | 16 February 2017 03:27 CET | Original file | - |
| article pdf uploaded. | 2 October 2014 10:42 CEST | Version of Record | https://www.mdpi.com/2076-0760/3/4/672/pdf |
