| article html file updated | 6 February 2020 06:49 CET | Update | https://www.mdpi.com/2076-0752/3/1/46 |
| article html file updated | 7 May 2019 19:37 CEST | Update | - |
| article html file updated | 21 March 2019 11:15 CET | Update | - |
| article html file updated | 14 February 2017 11:16 CET | Original file | - |
| article pdf uploaded. | 20 January 2014 14:01 CET | Version of Record | https://www.mdpi.com/2076-0752/3/1/46/pdf |
