| article html file updated | 6 February 2020 01:51 CET | Update | https://www.mdpi.com/2076-0787/2/2/160 |
| article html file updated | 19 September 2019 20:15 CEST | Update | - |
| article html file updated | 8 May 2019 05:38 CEST | Update | - |
| article html file updated | 20 March 2019 21:55 CET | Update | - |
| article html file updated | 18 January 2017 02:24 CET | Original file | - |
| article pdf uploaded. | 29 April 2013 15:16 CEST | Version of Record | https://www.mdpi.com/2076-0787/2/2/160/pdf |
