| article html file updated | 6 February 2020 19:21 CET | Update | https://www.mdpi.com/2076-0787/4/2/236 |
| article html file updated | 20 September 2019 22:21 CEST | Update | N/A |
| article html file updated | 6 May 2019 18:29 CEST | Update | N/A |
| article html file updated | 26 March 2019 04:07 CET | Update | N/A |
| article html file updated | 21 March 2017 04:14 CET | Original file | N/A |
| article pdf uploaded. | 3 June 2015 15:19 CEST | Version of Record | https://www.mdpi.com/2076-0787/4/2/236/pdf |
