| article html file updated | 6 February 2020 06:51 CET | Update | https://www.mdpi.com/2075-4701/4/1/20 |
| article html file updated | 7 May 2019 19:32 CEST | Update | N/A |
| article html file updated | 21 March 2019 11:20 CET | Update | N/A |
| article html file updated | 19 August 2015 18:18 CEST | Original file | N/A |
| article pdf uploaded. | 22 January 2014 08:35 CET | Version of Record | https://www.mdpi.com/2075-4701/4/1/20/pdf |
