| article html file updated | 8 February 2020 05:58 CET | Update | https://www.mdpi.com/2076-0752/6/2/7 |
| article html file updated | 24 September 2019 20:30 CEST | Update | N/A |
| article html file updated | 3 May 2019 21:50 CEST | Update | N/A |
| article html file updated | 30 June 2017 09:06 CEST | Original file | N/A |
| article pdf uploaded. | 16 May 2017 14:39 CEST | Version of Record | https://www.mdpi.com/2076-0752/6/2/7/pdf |
