| article html file updated | 7 February 2020 04:59 CET | Update | https://www.mdpi.com/2079-4991/6/3/39 |
| article html file updated | 5 May 2019 23:22 CEST | Update | - |
| article html file updated | 26 March 2019 21:37 CET | Update | - |
| article html file updated | 24 February 2017 10:16 CET | Update | - |
| article html file updated | 28 March 2016 11:27 CEST | Original file | - |
| article pdf uploaded. | 25 February 2016 09:32 CET | Version of Record | https://www.mdpi.com/2079-4991/6/3/39/pdf |
| article xml uploaded. | 25 February 2016 09:32 CET | Original file | https://www.mdpi.com/2079-4991/6/3/39/xml |
