| article html file updated | 6 February 2020 17:26 CET | Update | https://www.mdpi.com/2227-7080/3/2/74 |
| article html file updated | 20 September 2019 19:49 CEST | Update | - |
| article html file updated | 6 May 2019 22:22 CEST | Update | - |
| article html file updated | 26 March 2019 00:17 CET | Update | - |
| article html file updated | 21 August 2015 10:08 CEST | Original file | - |
| article pdf uploaded. | 9 April 2015 09:47 CEST | Version of Record | https://www.mdpi.com/2227-7080/3/2/74/pdf |
