| article html file updated | 6 February 2020 14:06 CET | Update | https://www.mdpi.com/2076-0787/3/4/699 |
| article html file updated | 20 September 2019 15:34 CEST | Update | N/A |
| article html file updated | 7 May 2019 04:39 CEST | Update | N/A |
| article html file updated | 25 March 2019 18:39 CET | Original file | N/A |
| article pdf uploaded. | 1 December 2014 15:34 CET | Version of Record | https://www.mdpi.com/2076-0787/3/4/699/pdf |
