| article html file updated | 6 February 2020 03:00 CET | Update | https://www.mdpi.com/2076-0787/2/3/328 |
| article html file updated | 19 September 2019 22:27 CEST | Update | N/A |
| article html file updated | 8 May 2019 03:15 CEST | Update | N/A |
| article html file updated | 21 March 2019 00:45 CET | Update | N/A |
| article html file updated | 21 March 2017 04:14 CET | Original file | N/A |
| article pdf uploaded. | 5 July 2013 11:15 CEST | Version of Record | https://www.mdpi.com/2076-0787/2/3/328/pdf |
