| article html file updated | 6 February 2020 03:48 CET | Update | https://www.mdpi.com/2076-0787/2/3/421 |
| article html file updated | 20 September 2019 00:02 CEST | Update | N/A |
| article html file updated | 8 May 2019 01:41 CEST | Update | N/A |
| article html file updated | 21 March 2019 03:01 CET | Update | N/A |
| article html file updated | 23 March 2017 10:29 CET | Original file | N/A |
| article pdf uploaded. | 15 August 2013 10:55 CEST | Version of Record | https://www.mdpi.com/2076-0787/2/3/421/pdf |
