| article html file updated | 7 February 2020 01:42 CET | Update | https://www.mdpi.com/2077-0375/5/4/844 |
| article html file updated | 6 May 2019 06:03 CEST | Update | N/A |
| article html file updated | 26 March 2019 15:38 CET | Original file | N/A |
| article pdf uploaded. | 4 December 2015 11:51 CET | Updated version of record | https://www.mdpi.com/2077-0375/5/4/844/pdf |
| article pdf uploaded. | 3 December 2015 12:34 CET | Version of Record | https://www.mdpi.com/2077-0375/5/4/844/pdf-vor |
