| article html file updated | 6 February 2020 15:12 CET | Update | https://www.mdpi.com/2076-0787/4/1/17 |
| article html file updated | 20 September 2019 16:58 CEST | Update | - |
| article html file updated | 7 May 2019 02:26 CEST | Update | - |
| article html file updated | 25 March 2019 20:32 CET | Update | - |
| article html file updated | 12 April 2017 10:58 CEST | Original file | - |
| article pdf uploaded. | 28 January 2015 07:57 CET | Updated version of record | https://www.mdpi.com/2076-0787/4/1/17/pdf |
| article pdf uploaded. | 14 January 2015 15:56 CET | Version of Record | https://www.mdpi.com/2076-0787/4/1/17/pdf-vor |
