| article html file updated | 6 February 2020 20:44 CET | Update | https://www.mdpi.com/2227-9709/2/3/20 |
| article html file updated | 6 May 2019 15:37 CEST | Update | N/A |
| article html file updated | 26 March 2019 06:46 CET | Update | N/A |
| article html file updated | 27 October 2017 10:29 CEST | Update | N/A |
| article html file updated | 21 August 2015 14:57 CEST | Original file | N/A |
| article pdf uploaded. | 16 July 2015 14:36 CEST | Version of Record | https://www.mdpi.com/2227-9709/2/3/20/pdf |
