| article html file updated | 21 May 2020 09:27 CEST | Update | https://www.mdpi.com/2073-4344/4/3/321 |
| article html file updated | 22 March 2019 00:36 CET | Update | N/A |
| article html file updated | 20 August 2015 18:15 CEST | Original file | N/A |
| article pdf uploaded. | 10 September 2014 15:31 CEST | Version of Record | https://www.mdpi.com/2073-4344/4/3/321/pdf |
