| article html file updated | 6 February 2020 08:25 CET | Update | https://www.mdpi.com/2077-0472/4/2/79 |
| article html file updated | 21 March 2019 15:04 CET | Update | N/A |
| article html file updated | 20 August 2015 02:19 CEST | Original file | N/A |
| article pdf uploaded. | 4 April 2014 14:24 CEST | Version of Record | https://www.mdpi.com/2077-0472/4/2/79/pdf |
