| article html file updated | 6 February 2020 21:07 CET | Update | https://www.mdpi.com/2076-0760/4/3/520 |
| article html file updated | 21 September 2019 00:52 CEST | Update | N/A |
| article html file updated | 6 May 2019 14:52 CEST | Update | N/A |
| article html file updated | 26 March 2019 07:30 CET | Update | N/A |
| article html file updated | 18 January 2017 06:54 CET | Original file | N/A |
| article pdf uploaded. | 28 July 2015 09:53 CEST | Version of Record | https://www.mdpi.com/2076-0760/4/3/520/pdf |
