| article html file updated | 6 February 2020 12:56 CET | Update | https://www.mdpi.com/2304-6740/2/4/552 |
| article html file updated | 20 September 2019 13:52 CEST | Update | - |
| article html file updated | 7 May 2019 06:55 CEST | Update | - |
| article html file updated | 22 March 2019 02:53 CET | Update | - |
| article html file updated | 20 August 2015 23:35 CEST | Original file | - |
| article pdf uploaded. | 17 October 2014 14:16 CEST | Version of Record | https://www.mdpi.com/2304-6740/2/4/552/pdf |
