| article html file updated | 6 February 2020 22:42 CET | Update | https://www.mdpi.com/2076-0787/4/3/436 |
| article html file updated | 6 May 2019 11:32 CEST | Update | N/A |
| article html file updated | 26 March 2019 10:33 CET | Original file | N/A |
| article pdf uploaded. | 11 September 2015 14:52 CEST | Version of Record | https://www.mdpi.com/2076-0787/4/3/436/pdf |
