| article html file updated | 6 February 2020 16:43 CET | Update | https://www.mdpi.com/2076-0825/4/1/39 |
| article html file updated | 6 May 2019 23:36 CEST | Update | N/A |
| article html file updated | 25 March 2019 23:07 CET | Update | N/A |
| article html file updated | 21 August 2015 08:57 CEST | Original file | N/A |
| article pdf uploaded. | 17 March 2015 15:50 CET | Version of Record | https://www.mdpi.com/2076-0825/4/1/39/pdf |
