| article html file updated | 6 February 2020 09:46 CET | Update | https://www.mdpi.com/2304-6740/2/2/264 |
| article html file updated | 7 May 2019 13:31 CEST | Update | N/A |
| article html file updated | 21 March 2019 18:19 CET | Update | N/A |
| article html file updated | 20 August 2015 09:12 CEST | Original file | N/A |
| article pdf uploaded. | 6 June 2014 09:56 CEST | Version of Record | https://www.mdpi.com/2304-6740/2/2/264/pdf |
