| article html file updated | 6 February 2020 03:35 CET | Update | https://www.mdpi.com/2076-0787/2/3/404 |
| article html file updated | 19 September 2019 23:35 CEST | Update | N/A |
| article html file updated | 8 May 2019 02:09 CEST | Update | N/A |
| article html file updated | 21 March 2019 02:23 CET | Update | N/A |
| article html file updated | 23 March 2017 10:29 CET | Original file | N/A |
| article pdf uploaded. | 2 August 2013 14:25 CEST | Version of Record | https://www.mdpi.com/2076-0787/2/3/404/pdf |
